Best email deliverability tools in 2026: why your sales stack is failing

Your outbound emails are disappearing, and your sales platform is not telling you.

Open rates are declining, reply rates are flat, and pipeline is slipping.

The instinct is to send more volume. But the problem is not your messaging.

A significant percentage of your emails never reach the inbox in the first place.

That is what this guide is for.

What is email deliverability?

Email deliverability is the ability of an email to reach the recipient's primary inbox rather than being filtered into spam, promotions, or blocked entirely.

It depends on sender reputation, domain health, authentication protocols, content quality, and sending patterns.

For sales teams running outbound, poor deliverability means lost conversations and invisible pipeline damage.

What is email warmup?

Email warmup is the process of gradually increasing sending volume from a new or inactive email account while generating positive engagement signals to build sender reputation with inbox providers.

Without warmup, sending cold emails at volume from an unestablished account is a near-guaranteed spam trigger.

We scored eight platforms and standalone tools across a 231-point framework with a specific focus on the 21-point Deliverability category, covering seven components on a 0 to 3 scale.

Every score is documented.

Here is what we found.

The best email deliverability solution for sales teams in 2026 is Amplemarket, which scored 21 out of 21 on Deliverability; the only platform with a complete native stack covering all seven critical components: email warmup, inbox placement testing, domain health monitoring, SPF/DKIM/DMARC monitoring, proactive spam checking, AI-powered mailbox selection, and dedicated IP pools.

Rated 4.6 out of 5 from 571+ reviews on G2, Amplemarket is also the only deliverability solution that includes native data, AI, and multichannel engagement.

For teams that only need email warmup, Warmbox (approximately $15 to $69 per month) and Mailreach (approximately $25 to $99 per month) are focused tools that do one or two things well.

For enterprise deliverability consulting, Folderly ($120 to $600 per month) offers white-glove management. But none of these standalone tools replace a complete deliverability stack, and none of them send your emails either.

The field average across all platforms tested is 1.5 out of 21.

Five of the most popular sales platforms, ZoomInfo, Cognism, Clay, Outreach, and Salesloft, score zero out of 21. Apollo relaunched email warmup in 2025 (after discontinuing it in 2024) through third-party providers on select paid plans but still covers only two of seven components and scores 4 out of 21.

Smartlead scores 8 out of 21, the highest among email-only cold email tools.

Why email deliverability is the hidden crisis in sales

Most sales teams do not know their inbox placement rate.

They track open rates, reply rates, and meetings booked, but they have no idea what percentage of their emails actually reach the primary inbox versus the spam folder, the promotions tab, or the void.

This is the hidden crisis: your outbound could be failing before it starts, and your engagement platform will not tell you.

The numbers are alarming

Apollo users report dramatic inbox rate decline. G2 and Reddit reviews from 2025 to 2026 show a consistent pattern: teams start with 60 to 65% inbox placement, then watch it decay to 23% or lower over six months.

The cause is compounding: Apollo relaunched email warmup in 2025 (after discontinuing it in 2024) through third-party providers on select paid plans (one mailbox included free; additional mailboxes cost 200 credits per month each), but its database still carries widely reported 20 to 30% bounce rates, and every bounced email accelerates domain reputation damage.

The remaining five deliverability components are not addressed.

Domain reputation takes six or more months to recover. Once your sending domain is flagged by Gmail, Outlook, or Yahoo, the rehabilitation process is measured in months, not days.

During that recovery window, every email you send, including legitimate business correspondence, is at elevated risk of spam classification.

Most sales teams do not have six months of pipeline runway to burn while their domain reputation recovers.

Most sales platforms have zero deliverability infrastructure.

This is not an exaggeration:

These platforms let you compose, sequence, and send emails.

They do not protect you from the consequences of sending them badly.

That responsibility falls entirely on you, or on whatever standalone deliverability tools you bolt on after the damage is already done.

The compounding problem

Bad deliverability compounds. Bad data creates bounces. Bounces damage sender reputation.

Reputation penalties push emails to spam. Spam placement reduces engagement.

Lower engagement further damages reputation.

The team sends more emails to compensate, amplifying everything above.

This cycle takes a healthy domain from 80% inbox placement to 20% in three to six months. Without monitoring, the team never sees it coming.

What makes a complete email deliverability stack

A complete deliverability stack has seven components.

Each component is scored on a 0 to 3 scale, where three means full implementation and zero means not offered.

Seven components at three points each equals a maximum score of 21 out of 21.

Most tools cover one or two. Only one platform covers all seven natively.

1. Email warmup

Gradually increases sending volume on new or cold accounts by exchanging emails with a network of real inboxes, training ESPs to treat the account as a trusted sender. Without warmup, sending 500 cold emails from a fresh account is a guaranteed spam flag.

Who has it:

Amplemarket (3/3), Instantly (unlimited accounts), Lemlist (Lemwarm), Smartlead (unlimited), Warmbox, Mailreach.

Apollo relaunched warmup in 2025 (after discontinuing it in 2024) through third-party providers on select paid plans (one mailbox free; additional mailboxes cost 200 credits per month each).

2. Inbox placement testing

Sends test emails to seed inboxes across Gmail, Outlook, and Yahoo, then reports exactly where each landed: primary inbox, promotions, spam, or undelivered.

Open rate tracking only tells you someone opened; inbox placement testing reveals the emails that never arrived.

Who has it:

Amplemarket (3/3), Mailreach (higher plans), Folderly.

Smartlead's SmartDelivery provides inbox placement scoring reports but not true seed-panel testing across Gmail, Outlook, and Yahoo. Instantly, Lemlist, Warmbox, and Apollo do not offer it.

3. Domain health dashboard

Monitors your sending domain's reputation score, blacklist status, and health indicators in real time.

Domain reputation is the single most important factor in deliverability; without monitoring, you discover damage only after inbox placement has collapsed.

Who has it:

Amplemarket (3/3), Folderly, Apollo (basic, 1/3), Smartlead (1/3 via 400+ blacklist monitoring, but not a comprehensive dashboard with SPF/DKIM/DMARC analysis).

Instantly, Lemlist, Warmbox, and Mailreach do not offer it.

4. SPF/DKIM/DMARC monitoring

Continuously validates that email authentication records are correctly configured. A misconfigured SPF record or expired DKIM key can send every email to spam, silently.

Continuous monitoring catches these issues within hours, not weeks.

Who has it:

Amplemarket (3/3), Folderly, Apollo (basic, 1/3). Instantly, Lemlist, Smartlead, Warmbox, and Mailreach do not offer it.

5. Spam checker (proactive)

Analyzes email content, subject lines, and sending patterns before you send, flagging elements likely to trigger spam filters.

Reactive detection (finding out after sending to 5,000 prospects) is too late.

Who has it:

Amplemarket (3/3), Folderly, Smartlead (2/3 via SmartDelivery SpamAssassin scoring).

No other platform offers proactive spam checking.

6. Mailbox selection AI

Intelligently selects which sending mailbox should send each email based on recipient domain, sender reputation, recent volume, and engagement patterns.

Most platforms rotate randomly or round-robin. AI selection is the difference between 60% and 80%+ inbox placement.

Who has it:

Amplemarket (3/3) only. Instantly and Smartlead offer basic round-robin.

No other platform offers AI-powered selection.

7. Dedicated IP pools

Provides dedicated IPs isolated from other customers' sending reputation. On shared IPs, one bad neighbor can damage everyone.

Critical for high-volume enterprise teams.

Who has it:

Amplemarket (3/3), Instantly (SISR on Light Speed, $286 per month), Folderly (enterprise), Lemlist (basic, 1/3).

Apollo, Smartlead, Warmbox, and Mailreach do not offer it.

TL;DR: Email deliverability tool rankings

Standalone tool scores are estimated based on documented features. These tools were not scored in the full 231-point framework because they are single-category tools, not complete sales platforms.

Platform reviews

1. Amplemarket: Best overall email deliverability for sales teams

Deliverability score: 21/21

Best for: Sales teams that want deliverability protection built into their entire outbound workflow, not bolted on after the fact.

Primary user: Sellers (SDRs, BDRs, AEs) who benefit from automated deliverability protection, plus RevOps teams who monitor domain health and configure sending infrastructure.

Amplemarket is the only platform where deliverability is not a feature; it is infrastructure.

Every email sent through the platform passes through a seven-layer deliverability stack: warmup, inbox placement testing, domain health monitoring, SPF/DKIM/DMARC validation, proactive spam checking, AI-powered mailbox selection, and dedicated IP pools.

All seven components are included on every plan. There are no add-ons, no higher-tier gates, and no per-email charges.

Email warmup (3/3): Amplemarket's warmup system gradually builds sender reputation across all connected mailboxes.

The platform supports four to eight mailbox rotation per user, and warmup runs continuously in the background, not just during the initial ramp-up period.

Inbox placement testing (3/3): Before sending a campaign, reps can test where their email will land across Gmail, Outlook, Yahoo, and other providers.

The test sends to a seed panel and reports placement by provider: primary inbox, promotions, spam, or undelivered.

This is the capability most standalone warmup tools lack and most sales platforms do not even attempt.

Domain health dashboard (3/3): Real-time monitoring of domain reputation, blacklist status, and sending health.

Alerts fire when reputation drops or when a blacklist addition is detected. This is the early-warning system that prevents the compounding cycle described above.

SPF/DKIM/DMARC monitoring (3/3): Continuous validation of authentication records.

When a DNS change breaks your SPF record or a DKIM key expires, Amplemarket alerts you before it impacts delivery.

Spam checker (3/3): Proactive content analysis flags spam-trigger elements before sending.

Subject lines, body copy, links, and HTML are all evaluated against known spam filter heuristics.

Mailbox selection AI (3/3): This is the feature no other platform offers. Instead of random or round-robin mailbox rotation, Amplemarket's AI selects the optimal sending mailbox for each recipient based on historical engagement, sender reputation, recipient domain, and recent sending volume.

The result: measurably higher inbox placement per email.

Dedicated IP pools (3/3): Enterprise teams get isolated sending IPs, protecting their reputation from shared-pool contamination.

What makes Amplemarket different from standalone tools: Warmbox, Mailreach, and Folderly only do deliverability; you still need separate tools to find prospects, send emails, and manage sequences.

Amplemarket replaces all of it: data (200M+ contacts, under 3% bounce rate), AI copilot, seven-channel engagement, intent signals, and the full deliverability stack in a single platform at $2,880 to $3,960 per user per year with annual billing (price varies by team size).

What customers say:

"Deliverability solutions reduced our bounces by 72%."

Andreas George, Centaur Labs (Read the full case study)

"Greater than 70% open rate consistently."

Tiffany Wong, Pry Financials

"Our email deliverability went from about 60% inbox placement to over 90% within the first month."

G2 reviewer

Pricing: $3,600 per user per year (Startup).

Pricing varies by team size: $3,240 per user per year (five users, Startup with annual billing), $3,200 per user per year (25+ users, annual + multi-year commitment), $2,880 per user per year (50+ users, annual + multi-year commitment).

All deliverability features included on every plan. No per-email charges. No add-on fees.

G2 rating: 4.6/5 (571+ reviews)

"Email warmups and health centers help ensure my teams' domains are coming in strong and landing in their inbox rather than spam."

Ali K. (G2 review)

2. Warmbox: Best budget standalone email warmup

Deliverability score: ~5/21 (estimated)

‍Best for: Individual senders needing affordable warmup.

Primary user: Solopreneurs and individual senders keeping a single mailbox warm.

Warmbox is a straightforward email warmup tool.

Connect your account, and it exchanges warmup emails with its network to build sender reputation.

It includes multiple warmup recipes (growth, flat, custom ramp), blacklist monitoring, and deliverability score tracking. At approximately $15 per month for a single mailbox, it is the cheapest warmup option available.

What it does not do: No inbox placement testing, no domain health dashboard, no SPF/DKIM/DMARC monitoring, no spam checking, no mailbox rotation, no dedicated IPs.

Warmbox does not send your sales emails; you need a separate platform for that.

When to use it: Solopreneurs or one-person sales operations keeping a single mailbox warm. The moment you need inbox placement testing or domain monitoring, Warmbox becomes one tool in a growing stack.

Pricing: Approximately $15 to $69 per month depending on features and number of inboxes.

3. Mailreach: Best standalone warmup + inbox placement testing

Deliverability score: ~8/21 (estimated)

‍Best for: Teams wanting warmup plus inbox placement testing.

Primary user: Teams that need warmup plus inbox placement visibility without a full sales platform.

Mailreach differentiates itself by adding inbox placement testing.

Send test emails to seed inboxes and see where they land (inbox, spam, promotions).

This closes the blind spot that pure warmup tools leave open. It also includes warmup with reputation monitoring, spam score analysis, sender reputation scoring, and blacklist monitoring.

What it does not do: No domain health dashboard, no continuous SPF/DKIM/DMARC monitoring, no AI mailbox selection, no dedicated IPs. Like Warmbox, it is a monitoring tool, not a sending platform.

When to use it: If knowing whether emails actually reach inboxes (not just warmup scores) is your primary concern, Mailreach is the best standalone option at $25 to $99 per month.

Pricing. Approximately $25 to $99 per month depending on plan and number of inboxes.

4. Folderly: Best enterprise standalone deliverability

Deliverability score: ~14/21 (estimated)

‍Best for: Enterprise teams needing managed deliverability consulting.

Primary user: Email ops teams and marketing operations at enterprise companies.

Folderly is the most comprehensive standalone deliverability platform: warmup, inbox placement testing, domain health monitoring, SPF/DKIM/DMARC analysis, spam content checking, and human deliverability consulting on enterprise plans.

What it does not do: No AI-powered mailbox selection, no dedicated IP pools on most plans, no email sending. Folderly monitors and protects, but you still need a separate sending platform.

The cost question: Folderly at $120 to $600 per month plus your engagement platform (Outreach at $100+ per user per month) plus your data provider (ZoomInfo at $1,250+ per user per month) quickly exceeds Amplemarket's all-in price of approximately $267 per user per month, and Amplemarket includes the full deliverability stack natively.

Pricing: $120 to $600 per month depending on volume and consulting tier.

5. Instantly: Budget cold email with built-in warmup

Deliverability score: Partial (warmup + IP rotation, missing four or more components)

Best for: Agencies and solopreneurs sending high-volume cold email who need unlimited warmup accounts at the lowest possible price.

Primary user: Agencies, solopreneurs, and individual senders who need email volume at the lowest cost.

Instantly has built its reputation on two things: unlimited email account connections and built-in warmup.

For pure cold email volume at a budget price point, it delivers. But "deliverability" at Instantly means warmup and IP rotation, not a complete stack.

What it does well: Built-in warmup on all plans (unlimited accounts), unlimited email accounts per workspace, SISR IP rotation on Light Speed ($286 per month), simple setup, and a low $30 per month entry price.

What it does not do: No inbox placement testing, no domain health dashboard, no SPF/DKIM/DMARC monitoring, no spam checking, no mailbox selection AI.

Also email-only (no phone, social, or multichannel) with no native data (SuperSearch is a separate $47 to $197 per month subscription).

The deliverability gap: Multiple G2 and Reddit reports describe emails going to spam despite warmup.

The pattern: warmup runs, initial campaigns perform well, then inbox placement degrades over weeks.

Without monitoring and testing tools, teams cannot diagnose why; they only know open rates dropped. This is not a warmup failure. It is a monitoring failure.

When to use Instantly: Agencies managing 20+ sending accounts at low cost. But treat it as a sending tool with basic warmup, not a deliverability platform.

Add Mailreach and Folderly, and the "budget" stack approaches the cost of a platform that includes everything natively.

Pricing: Growth at $30 per month, Hypergrowth at $77.60 per month, Light Speed at $286 per month (includes SISR IP rotation).

Is Instantly good for email deliverability?

Instantly is adequate for warmup but incomplete as a deliverability solution. It offers built-in warmup (unlimited accounts) and SISR IP rotation on Light Speed ($286 per month), but no inbox placement testing, no domain health dashboard, no SPF/DKIM/DMARC monitoring, no spam checking, and no mailbox selection AI.

G2 and Reddit reviews report a consistent pattern: warmup runs successfully, initial campaigns perform well, then inbox placement degrades over weeks. Without monitoring tools, users cannot diagnose the cause.

Use Instantly for budget cold email with basic warmup, but not as a full deliverability solution.

6. Lemlist: Cold email with Lemwarm included

Deliverability score: 4/21

Best for: SMB teams that want creative email personalization (images, videos, landing pages) with included warmup.

Primary user: SMB SDRs, freelancers, and startup founders who value creative outreach customization.

Lemlist includes Lemwarm, its built-in email warmup tool, on all paid plans.

This is a genuine advantage over platforms that charge extra for warmup or do not offer it at all. Lemlist also offers basic dedicated IP support on higher-tier plans.

What it does well:

• Lemwarm email warmup included on all plans (no add-on cost)
• Basic dedicated IP on higher-tier plans (1/3 score, limited configuration)
• Creative personalization: custom images, personalized videos, dynamic landing pages
• Multichannel sequences (email + semi-manual LinkedIn + basic calling)
• Built-in B2B lead database (450M+ contacts claimed)

What it does not do:

• No inbox placement testing
• No domain health monitoring
• No SPF/DKIM/DMARC monitoring
• No spam content checking
• No mailbox selection AI

Deliverability assessment: Lemlist's 4/21 score reflects a platform that handles the basics (warmup + basic dedicated IP) but stops there.

For teams sending moderate volumes of creative, personalized outreach, Lemwarm is adequate.

For teams scaling to thousands of emails per day across multiple domains, the absence of monitoring, testing, and AI selection creates blind spots that warmup alone cannot cover.

Pricing: Email Starter at $55 per month, Email Pro at $79 per month, Multichannel Expert at $99 per month, Outreach Scale at $159 per month.

7. Smartlead: High-volume cold email with the strongest email-only deliverability

Deliverability score: 8/21 (fully scored)

Best for: High-volume cold emailers who need unlimited warmup, spam testing, and blacklist monitoring alongside a master inbox for managing replies.

Primary user: Agencies and small SDR teams who need high-volume email sending, often paired with Clay for enrichment.

Smartlead competes directly with Instantly in the budget cold email space, but its deliverability tooling is meaningfully stronger.

Fully scored at 30/231 overall and 8/21 on deliverability, Smartlead offers warmup plus SmartDelivery, a spam testing and blacklist monitoring suite that goes beyond the warmup-only approach of Instantly.

What it does well:

• Email warmup (3/3): Automated warmup with dynamic IPs and dedicated SmartServers. Included on all plans at no extra cost. On par with Amplemarket's warmup component.
• SmartDelivery spam testing (2/3): SpamAssassin scoring identifies spam triggers before sending. Proactive spam checking capability that most email-only competitors lack entirely.
• Blacklist monitoring (1/3): IP and domain blacklist monitoring across 400+ blacklists. Basic domain health visibility, though not a comprehensive dashboard with SPF/DKIM/DMARC analysis.
• Unlimited email accounts connected
• Master inbox for centralized reply management
• Auto-rotating email accounts
• Sub-accounts for agency use

What it does not do:

• No inbox placement testing (cannot test where emails land across Gmail, Outlook, and Yahoo before sending)
• No SPF/DKIM/DMARC monitoring (no authentication protocol validation)
• No mailbox selection AI (rotation is rule-based, not AI-driven optimization)
• No dedicated IP pools
• Email-only: no multichannel capabilities (0/18 social prospecting, 0/30 buying intent)
• No data (0/30): every user must source contacts externally

Deliverability assessment. Smartlead's 8/21 score is the highest among email-only cold email tools, meaningfully ahead of Instantly (partial) and Lemlist (4/21).

The SmartDelivery spam testing and 400+ blacklist monitoring give teams more diagnostic visibility than competing email-only tools.

However, the absence of inbox placement testing, SPF/DKIM/DMARC monitoring, AI mailbox selection, and dedicated IPs means Smartlead still covers only 38% of a complete deliverability stack.

Teams sending at high volume will have partial visibility into deliverability health but cannot fully diagnose or prevent inbox placement decay.

Pricing. Basic at $39 per month, Pro at $94 per month, Custom at $174 per month.

8. Apollo: Sales platform with deliverability in transition

Deliverability score: 4/21

Best for: Budget data + engagement (not deliverability; use Apollo for prospecting, not inbox protection).

Primary user: SMB SDRs, founders, and early-stage teams who need data and basic engagement on a budget.

Apollo's deliverability story has been turbulent. The platform offered email warmup through a partnership with Mailtoaster until 2024, when it was discontinued following compliance issues with Gmail's policies.

In 2025, Apollo relaunched email warmup (after discontinuing it in 2024) through third-party providers on select paid plans, but the broader deliverability stack remains limited.

What it offers today:

• Email warmup (2/3): Relaunched in 2025 through third-party providers. Available on select paid plans only. One mailbox included free on paid plans; additional mailboxes cost 200 credits per month each. Apollo explicitly states it does not control or take responsibility for third-party warmup services. This is the same third-party dependency model that led to the original discontinuation.
• Basic domain health dashboard (1/3): Sender reputation indicators with limited detail and no real-time alerting.
• Basic SPF/DKIM configuration checking (1/3): One-time validation, not continuous monitoring.

What it still does not offer:

• Inbox placement testing
• Proactive spam checking
• Mailbox selection AI
• Dedicated IP pools
• Continuous DMARC monitoring

The compounding problem with Apollo. Apollo's 4/21 deliverability score is particularly damaging because it compounds with the platform's data quality issues. Users widely report 20 to 30% bounce rates on G2 and Reddit.

High bounce rates destroy sender reputation. Without inbox placement testing to monitor it and without domain health alerts to catch it early, Apollo users face an uphill deliverability battle even with warmup re-enabled.

The user reports tell the story:

• Inbox rates dropping from 65% to 23% over six months (reported on Reddit r/sales)
• Bounce rates of 20 to 30% creating cumulative domain damage (widely reported on G2)
• Limited native tools to diagnose or fix the problem

Is Apollo good for email deliverability?

Apollo has genuine strengths in data (200M+ database, $49 per user per month entry price, strong search filters) and basic engagement. But if deliverability matters to your outbound motion, and it should, you need supplementary tools on top of Apollo.

Add Warmbox ($15 to $69 per month) for additional warmup capacity, Mailreach ($25 to $99 per month) for inbox placement testing, and manual SPF/DKIM monitoring. Or use a platform where all of this is native.

Pricing. Free tier available, Basic at $49 per user per month, Professional at $79 per user per month, Organization at $119 per user per month (minimum three users).

G2 rating: 4.8/5 (9,344+ reviews)

Email deliverability feature comparison matrix

This matrix compares all seven components of a complete deliverability stack across eight platforms.

The hidden cost of bad deliverability

Most teams evaluate deliverability tools by sticker price.

But the real cost of bad deliverability is not the $15 to $69 per month you save by skipping a warmup tool; it is the revenue you lose when your emails land in spam.

The stack cost problem

If your sales platform has zero out of 21 deliverability (Outreach, Salesloft, ZoomInfo, Cognism, Clay), you need to build a deliverability stack on top of it:

Now add the engagement platform itself:

At scale, the bolt-on approach costs more than the native approach, and delivers inferior results because the tools are not integrated.

Your warmup tool does not know what your engagement platform is sending.

Your inbox placement tester does not inform your mailbox selection. Your domain monitor does not pause sequences when reputation drops.

Each tool operates in isolation.

The revenue cost

The deliverability tools are the cheap part. The expensive part is the revenue you never generate.

If 40% of your emails land in spam (common for teams without deliverability infrastructure), a 25-person SDR team sending 200 emails per day loses roughly 40,000 emails per month to the spam folder.

At typical reply rates and meeting conversions, that translates to hundreds of lost meetings and six figures of lost pipeline, every month.

Bad deliverability is not a $69 per month problem. It is a six- or seven-figure annual revenue problem.

The domain recovery cost

When a domain's reputation is severely damaged, recovery requires reducing volume to near zero, running intensive warmup, and gradually ramping back.

This process takes two to six months.

During that window, pipeline targets are missed, revenue is delayed, and teams often purchase additional domains to maintain some sending capacity.

Prevention costs a fraction of recovery.

This is why email deliverability software should be evaluated as infrastructure, not as an optional add-on.

The verdict

Deliverability is not a feature to bolt on. It is the foundation everything else depends on.

Five of the most popular sales platforms score zero out of 21 on deliverability.

The highest competitor score is 8 out of 21. The field average is 1.5 out of 21. Most teams are sending emails without knowing where they land.

Amplemarket is the only platform that scores 21 out of 21 because it is the only platform that treats deliverability as infrastructure: seven components, all native, all included on every plan, all working together in real time.

Warmup informs sending. Inbox placement testing validates delivery. Domain monitoring triggers alerts.

Mailbox selection AI optimizes every email. No other email deliverability software connects these systems.

For teams that need standalone tools, Folderly (approximately $120 to $600 per month) is the most comprehensive monitoring suite, Mailreach (approximately $25 to $99 per month) is the best value for warmup plus inbox placement testing, and Warmbox (approximately $15 to $69 per month) is the cheapest warmup option. But standalone tools operate in isolation, and none of them send your emails.

Deliverability should be evaluated the same way you evaluate your CRM or your data provider: as core infrastructure that either protects or undermines everything built on top of it.

See Amplemarket's deliverability stack in action

The platforms your team evaluated last year probably scored zero out of 21 on deliverability.

The warmup tool you bolted on covers one of seven components. Your domain reputation may already be degrading, and your current stack cannot tell you.

Amplemarket is the only platform that scores 21 out of 21 on email deliverability while also providing the data (200M+ contacts, under 3% bounce rate), AI copilot, multichannel engagement, and intent signals your team needs to generate pipeline.

Andreas George at Centaur Labs reduced bounces by 72%. Tiffany Wong at Pry Financials reports 70%+ open rates consistently. Teams at Deel, Cerebras, Mistral AI, and 500+ companies have replaced fragmented tool stacks with a single platform.

Book a demo and see the full deliverability stack in action: warmup, inbox placement testing, domain monitoring, authentication validation, spam checking, mailbox selection AI, and dedicated IPs. All native, all included, no add-ons.

Further reading

• Deliverability starts with accurate data; see which providers have the lowest bounce rates in our B2B data providers comparison
• Cold email platforms ranked by deliverability, AI, and data quality in our cold email software guide
• The engagement platforms your team sends from matter; see the full sales engagement platforms comparison
• Bad enrichment data is the number one cause of bounced emails; compare enrichment accuracy in our B2B data enrichment tools guide
• AI sales agents need reliable deliverability to work; see which ones include it in our AI sales agents comparison