Best software · Sales
10 Best Email Warmup Tools of 2026
This list is for SDR teams, founders and lead generation agencies that buy new sending domains and mailboxes and need them trusted by Gmail and Outlook before a cold campaign starts. We compared documented features and published prices for 10 tools: warmup bundled into cold email platforms, standalone warmup services, and higher-priced reputation services with expert help. Scores weigh features at 40%, ease of use at 30% and value at 30%. Every price is the vendor's own US dollar figure from its pricing page as fetched in November 2026.
By the Mojolin research desk · Updated November 9, 2026 · 10 tools compared · Prices checked on vendor pages, latest November 9, 2026
Questions or corrections: editorial@mojolin.com
Mojolin is self-funded How we score
Instantly is our top pick because every Outreach plan warms unlimited email accounts through a pool of more than 1,000,000 accounts, so adding a new domain never raises the bill, and you can send campaigns from the same place. TrulyInbox is the best standalone choice when your sequencer lacks good warmup, since it charges for daily warmup emails instead of per mailbox. Smartlead fits agencies already sending from it, MailReach and lemwarm are solid per-mailbox services, and Warmy, Mailwarm, InboxAlly and Folderly cost more but add placement testing, seed lists or expert guidance for teams fixing a damaged reputation.
Top picks
Best overall
Instantly
9.0 / 10
Outbound teams and agencies warming many new domains and inboxes that also want to send campaigns from the same tool.
Read the review →Runner-up
TrulyInbox
8.6 / 10
Teams with many mailboxes that want warmup only and use a separate sequencer.
Read the review →Also great
Smartlead
8.5 / 10
Agencies that run client campaigns in Smartlead and want warmup inside the same platform.
Read the review →Comparison table
| # | Tool | Pricing | Score | |
|---|---|---|---|---|
| 1 | Instantly | Outbound teams and agencies warming many new domains and inboxes that also want to send campaigns from the same tool. | Outreach Growth $47 per month, or $37.60 per month billed yearly, with unlimited email accounts and warmup; Hypergrowth $107 ($85.58 yearly); Light Speed $358 ($286.30 yearly) | 9.0 |
| 2 | TrulyInbox | Teams with many mailboxes that want warmup only and use a separate sequencer. | Free plan for 1 account; Starter $22 per month billed yearly ($29 monthly) for 200 warmup emails a day; Growth $84 ($99 monthly); Scale $169 ($199 monthly) | 8.6 |
| 3 | Smartlead | Agencies that run client campaigns in Smartlead and want warmup inside the same platform. | Base $39 per month ($32 billed yearly); Pro $94 ($78 yearly); Unlimited Smart $174 ($144 yearly); Unlimited Prime $379 ($315 yearly) | 8.5 |
| 4 |  MailReach | Outbound teams that want a focused warmup tool with placement testing included. | $19.50 per mailbox per month, with at least 20 spam test credits included; 20% off on annual billing | 8.4 |
| 5 |  lemwarm | lemlist users and teams that want warmup emails based on their real templates. | Essential $24 per mailbox per month billed yearly ($29 monthly); Smart $40 billed yearly ($49 monthly); included with every lemlist plan | 8.3 |
| 6 |  Warmy | Teams that want warmup plus testing, verification and DMARC in one subscription. | Plans from $49 per month, priced by warmup volume; 7-day free trial with no credit card | 8.1 |
| 7 |  Warmbox | Solo senders who need to warm one inbox at the lowest paid price. | Solo $15 per month billed yearly ($19 monthly) for 1 inbox; Start-up $69 ($79 monthly) for 3 inboxes; Growth $139 ($159 monthly) for 6 inboxes | 7.9 |
| 8 |  Mailwarm | Teams that want hands-on help from a deliverability expert while their inboxes warm. | Starter $79 per month ($69 billed yearly) for 1 mailbox; Growth $189 ($159 yearly) for 3 mailboxes; Scale $549 ($479 yearly) for 10 mailboxes | 7.6 |
| 9 |  InboxAlly | High-volume senders and agencies repairing or protecting domain reputation with measured results. | Starter $149 per month for 100 seed emails a day; Plus $645; Premium $1,190; Enterprise by quote; 10-day free trial | 7.4 |
| 10 |  Folderly | B2B sales organizations that want managed deliverability rather than a self-serve warmup tool. | $96 per mailbox per month billed yearly for 1 to 9 mailboxes; $72 for 10 to 24; $56 for 25 to 99; custom above 100 | 7.1 |
Scoring weights
Every tool gets three editorial scores out of 10, from vendor documentation, product pages and the published price. The overall score is the weighted average below, the same method on every list. Full method
The full ranking
Rank 1 · Best overall
Instantly
A cold email platform whose Outreach plans include unlimited email accounts and unlimited warmup through its own deliverability network.
instantly.ai9.0
out of 10
Best for: Outbound teams and agencies warming many new domains and inboxes that also want to send campaigns from the same tool.
Instantly treats warmup as part of the sending platform rather than a separate product. Once you connect Google, Outlook or SMTP accounts, one click turns on warmup, which sends, opens and replies to messages between your accounts and a pool that Instantly puts at more than 1,000,000 real email accounts. A slow ramp starts each mailbox at two warmup emails and adds two per day, read emulation scrolls through warmup messages to look human, and you can set the open rate, reply rate and daily randomness yourself. A deliverability dashboard shows how many warmup emails landed in inbox and spam, which tells you when a domain is ready.
The key point for teams buying many domains is pricing: every Outreach plan includes unlimited accounts and unlimited warmup, starting at $37.60 a month billed yearly. The trade-off is that you are buying a cold email tool, and Growth limits you to 5,000 emails and 1,000 uploaded contacts a month.
Standout feature
Every Outreach plan includes unlimited email accounts and unlimited warmup.
Use cases
Lead generation agencies
Warm dozens of new client domains at once
Outcome: Flat cost no matter how many inboxes are added
Founders
Buy three domains, warm them and launch a first sequence
Outcome: Warmup and sending handled in one tool
Key features
- Unlimited email accounts and unlimited warmup on every Outreach plan
- Deliverability pool of more than 1,000,000 real email accounts
- Slow ramp that starts at 2 warmup emails and adds 2 per day
- Read emulation through a private network of headless browsers
- Deliverability dashboard showing inbox and spam counts per account
Pros
- Adding a new inbox does not add to the bill
- Warmup turns on with one click after an account is connected
- Open rate, reply rate and spam protection settings are adjustable
Cons
- There is no warmup-only plan; you pay for the outreach platform
- Growth caps you at 1,000 uploaded contacts and 5,000 emails a month
- Lead database credits are a separate subscription
Rank 2 · Runner-up
TrulyInbox
A standalone AI warmup service that charges for daily warmup emails sent instead of per connected inbox.
trulyinbox.com8.6
out of 10
Best for: Teams with many mailboxes that want warmup only and use a separate sequencer.
TrulyInbox is a warmup-only service with an unusual pricing model: you pay for the number of warmup emails it sends each day, shared across as many inboxes as you connect. Starter covers 200 warmup emails a day, which the vendor says suits about three inboxes, Growth covers 1,000 a day for about 15 inboxes, and Scale covers 3,000 for about 50. The company recommends two warmup emails for every cold email, which makes it easy to size a plan before a campaign.
Every plan includes AI-written warmup content, an adaptive strategy that slows sending when reputation dips, a daily 0 to 100 deliverability score and SPF, DKIM and DMARC health checks. Growth adds industry-specific content, analytics by provider and custom sending hours. The free plan handles one account at 10 warmup emails a day. It does not send campaigns, so pair it with a sequencer that lacks good warmup.
Standout feature
It charges for warmup emails sent, not for accounts connected.
Use cases
SDR teams
Warm 15 new mailboxes used with an existing sequencer
Outcome: One Growth plan covers all of them
Solo founders
Warm a single new inbox before first outreach
Outcome: Done on the free plan
Key features
- Unlimited email accounts on every paid plan
- Plans sized by daily warmup volume, from 200 to 3,000 emails a day before Scale Plus
- AI-written warmup content, by topic and industry on Growth and above
- Daily deliverability score from 0 to 100 and account health monitoring
- Analytics by email provider and custom sending schedules on Growth
Pros
- Free plan for one account with no credit card
- Cost does not rise when you connect more inboxes
- 14-day money-back guarantee on paid plans
Cons
- Daily volume is shared, so each inbox gets less as you add accounts
- No campaign sending; you still need a cold email tool
- Export reports and provider analytics start on Growth
Rank 3 · Also great
Smartlead
A cold email platform with built-in warmup for unlimited mailboxes and a private, vetted warmup pool on higher plans.
smartlead.ai8.5
out of 10
Best for: Agencies that run client campaigns in Smartlead and want warmup inside the same platform.
Smartlead runs warmup automatically from the moment you connect a Gmail, Outlook or SMTP mailbox, and every plan lets you manage unlimited mailboxes. Its warmup pool is private and reward-based: only vetted senders get in, and the pricing table shows which tier you reach, Foundation on Base, Growth on Pro and Premium on Unlimited Smart and Prime. Warmup emails shuffle subject lines, copy and send times, and the AI moves messages from spam to inbox. Guardrails pause an inbox when bounces spike or spam flags appear, then resume it once it recovers.
For teams short on time, the SmartSenders add-on sells pre-warmed Google and Outlook mailboxes at $9 per mailbox a month, which skips part of the wait. Base starts at $39 a month with 6,000 sends and 2,000 contacts. The main limit is that the best warmup pool sits on the $174 plan, so small teams on Base get the entry tier.
Standout feature
Its private warmup pool only admits vetted senders and pauses risky inboxes automatically.
Use cases
Cold email agencies
Warm and rotate mailboxes across client workspaces
Outcome: Warmup and campaigns managed in one place
Sales teams on a deadline
Buy pre-warmed mailboxes for a launch next week
Outcome: Less time waiting on fresh inboxes
Key features
- Warmup starts automatically when a mailbox is connected
- Private, reward-based warmup pool for vetted senders
- Auto-pause on bounce spikes, spam flags or invalid inboxes
- Per-mailbox ramp profiles with daily caps and reply rates
- Manage unlimited mailboxes from one dashboard
Pros
- Warmup and sending in one platform
- Safety rules pause risky inboxes before damage spreads
- Pre-warmed Google and Outlook mailboxes can be bought in the app
Cons
- Warmup pool tier depends on plan, with Premium on Smart and above
- Base allows only 2,000 contacts and 6,000 sends a month
- No warmup-only plan
Rank 4
MailReach
A per-mailbox warmup service that bundles spam test credits and domain health checks.
mailreach.co8.4
out of 10
Best for: Outbound teams that want a focused warmup tool with placement testing included.
MailReach is a warmup service built for B2B senders. Its network focuses on Google Workspace and Office 365 inboxes, which the company calls the two providers that matter most, and warmup activity is designed to look like real conversations rather than canned replies. Each mailbox can send up to 100 warmup emails a day, a reputation dashboard tracks progress, and health checks cover blacklists, SPF, DKIM and DMARC.
Every warmup plan includes at least 20 spam test credits, so you can check where a real campaign email lands before you send it. Pricing is $19.50 per mailbox per month with 20% off on annual billing and custom quotes above 100 mailboxes. That is fair for a handful of inboxes, but a team warming 30 domains will pay more than with Instantly or TrulyInbox, which do not charge per inbox.
Standout feature
Every warmup plan includes at least 20 spam test credits.
Use cases
SDR managers
Warm five new rep inboxes and test the first sequence
Outcome: Placement confirmed before launch
Recruiters
Keep an outreach mailbox warm between campaigns
Outcome: Reputation stays steady
Key features
- Fully automated warmup with an AI warming algorithm
- Warmup network of Google Workspace and Office 365 inboxes
- At least 20 spam test credits with every warmup plan
- Up to 100 warmup emails per day per mailbox
- Health checks for blacklists, SPF, DKIM and DMARC
Pros
- Simple per-mailbox price
- Spam testing included instead of sold separately
- Compatible with any provider that supports SMTP
Cons
- Cost grows with every inbox you add
- Custom quote needed above 100 mailboxes
- Does not send campaigns
Rank 5
lemwarm
The warmup product from the makers of lemlist, sold on its own per mailbox and included with every lemlist plan.
lemwarm.com8.3
out of 10
Best for: lemlist users and teams that want warmup emails based on their real templates.
lemwarm is the warmup engine behind lemlist, also sold on its own. On lemlist's side it is part of an email infrastructure set that buys domains, sets up authentication automatically and caps daily sending per inbox, and lemwarm handles the reputation building by exchanging real emails with real inboxes. Bought separately, the Essential plan covers automatic warmup, human warmup emails, a technical setup check and deliverability reports, using a network of more than 20,000 healthy domains.
The Smart plan is where lemwarm differs from most rivals: it can warm up your actual email templates and match you to a network tailored to your industry, so the signals mailbox providers see look like your real outreach. Essential costs $24 per mailbox a month billed yearly and Smart costs $40. If you already pay for lemlist, warmup is included, which makes it the obvious choice for those teams.
Standout feature
The Smart plan warms up the email templates you will really send.
Use cases
lemlist users
Warm new inboxes before adding them to sequences
Outcome: No extra subscription needed
Niche B2B sellers
Warm with real templates and an industry network
Outcome: Warmup signals that match real outreach
Key features
- Automatic warmup with human-written warmup emails
- Warmup network of 20k+ healthy domains
- Technical setup check and deliverability reports
- Smart plan warms your real email templates
- Warmup network tailored to your industry on Smart
Pros
- Free with any lemlist plan
- Smart plan warms the templates you will actually send
- Setup check flags DNS problems early
Cons
- Per-mailbox pricing adds up for large fleets
- Template and industry targeting require the $40 Smart plan
- Volume pricing needs a sales call above 10 users
Rank 6
Warmy
An AI deliverability suite with warmup, a US seed list, placement tests, DMARC monitoring and email verification.
warmy.io8.1
out of 10
Best for: Teams that want warmup plus testing, verification and DMARC in one subscription.
Warmy goes further than warmup. Plans start at $49 a month and are priced by the volume of warmup emails you need, and each one includes a network of over 1 million mailboxes plus a seed list of more than 500,000 American mailboxes that open, reply to and rescue your emails from spam, rotated monthly. You choose a B2B network built around Google Workspace and Microsoft 365 or a B2C network for Gmail, Yahoo and Outlook consumers.
On top of warmup, plans bundle placement test credits, DMARC monitoring, email verification, a reputation tracker, Google Postmaster data, a template checker and the Adeline AI co-pilot, along with a dedicated deliverability expert and 24/7 human support. That is a lot for the money, but the pricing page does not spell out the volume behind the starting price, and some parts such as SendNova are still in beta. For a few new cold inboxes, it is more than you need.
Standout feature
Plans include a rotating seed list of more than 500,000 US mailboxes.
Use cases
Growth teams
Warm new domains and verify lists before a launch
Outcome: One vendor for warmup and list hygiene
Agencies
Monitor DMARC and placement across client domains
Outcome: Problems found before campaigns go out
Key features
- Warmup across a network of over 1 million mailboxes
- 500K+ US seed list that rotates every month
- Separate B2B and B2C warmup networks
- Placement test credits, DMARC monitoring and email verification
- Adeline AI co-pilot and Google Postmaster data
Pros
- Broadest set of deliverability tools in a warmup plan
- Dedicated deliverability expert and 24/7 human support
- Full API access on plans
Cons
- Exact plan limits are not listed on the pricing page
- Starting price is higher than most warmup-only tools
- Several features, such as SendNova, are in beta
Rank 7
Warmbox
A warmup tool with plans by inbox count and support for Gmail, Outlook, Yahoo, iCloud, Zoho, SendGrid, Amazon SES and SMTP.
warmbox.ai7.9
out of 10
Best for: Solo senders who need to warm one inbox at the lowest paid price.
Warmbox is a straightforward warmup tool with every feature included on every plan. It automatically removes your warmup emails from spam, replies to them and marks them as favorites, and you can choose a growth, flat or random warmup pattern on a schedule. A live checker covers DNS and blacklists, spam score monitoring tracks progress, and the tool supports an unusually long list of providers, from Gmail and Outlook to iCloud, Zoho and transactional services such as SendGrid, Mailgun and Amazon SES.
The Solo plan costs $15 a month billed yearly for one inbox at 50 warmup emails a day, which makes it the cheapest paid entry on this list. The math changes fast after that: Start-up is $69 for three inboxes and Growth is $139 for six, well above per-mailbox rivals. Warmbox itself says first results usually take 15 to 30 days of uninterrupted warming.
Standout feature
It supports transactional senders such as SendGrid, Mailgun and Amazon SES alongside regular inboxes.
Use cases
Freelancers
Warm one new outreach inbox
Outcome: Lowest paid cost on this list
SaaS teams
Warm a SendGrid or Amazon SES sender
Outcome: Supported without a workaround
Key features
- Auto-remove from spam, auto-reply and mark as favorite
- Growth, flat or random warmup modes with schedules
- Spam score monitoring and live DNS and blacklist checker
- Private inboxes network
- Integrations for Gmail, Outlook, Yahoo, iCloud, Zoho, SendGrid, Mailgun and Amazon SES
Pros
- Cheapest paid plan on this list
- Wide range of supported providers, including transactional ESPs
- All features included on every plan
Cons
- Solo is limited to 50 warmup emails a day
- Cost per inbox rises quickly on Start-up and Growth
- No campaign sending or placement test credits
Rank 8
Mailwarm
A warmup service that includes deliverability expert calls and an account manager on every plan.
mailwarm.com7.6
out of 10
Best for: Teams that want hands-on help from a deliverability expert while their inboxes warm.
Mailwarm sells warmup with people attached. Every customer gets an account manager who helps configure SPF, DKIM and DMARC, and every plan includes calls with a deliverability expert. The warmup itself runs across more than 50,000 aged real inboxes, and Mailwarm says each interaction produces five positive actions, including marking the email as not spam, opening it, marking it important and replying. You can choose which providers to warm against, including Gmail, Outlook, Microsoft 365, Yahoo and SMTP, and invalid inboxes are deactivated automatically to limit bounces.
Price is the catch. Starter is $79 a month, or $69 billed yearly, for a single mailbox, and Scale is $549 for ten. There is no traditional free trial, though you can add inboxes or extra interactions at $0.02 each at any time. Mailwarm states that stronger placement usually builds over 2 to 4 weeks.
Standout feature
Every plan includes an account manager and calls with a deliverability expert.
Use cases
First-time outbound teams
Set up authentication and warm a new domain with expert help
Outcome: Fewer setup mistakes
Founders hit by Microsoft blocks
Rebuild placement at Outlook and Microsoft 365
Outcome: Guided recovery with provider-level warmup
Key features
- Engagement across 50,000+ aged real inboxes
- Five positive actions per interaction, including rescue from spam and replies
- Provider-level control for Gmail, Outlook, Microsoft 365, Yahoo and SMTP
- Invalid inboxes deactivated automatically to reduce bounce risk
- Account manager and deliverability expert calls on every plan
Pros
- Human expert help included, not sold as an add-on
- Setup help for SPF, DKIM and DMARC
- Extra interactions available at $0.02 each
Cons
- Highest per-mailbox price among standalone warmup tools
- No traditional free trial
- Starter covers only one mailbox
Rank 9
InboxAlly
A deliverability platform that warms domains through seed engagement from real mailboxes, with placement testing and reputation scoring.
inboxally.com7.4
out of 10
Best for: High-volume senders and agencies repairing or protecting domain reputation with measured results.
InboxAlly approaches warmup from the marketing and reputation repair side. Instead of swapping mail between subscribers, it sends your messages to its seed mailboxes, where they are opened, replied to, marked important and rescued from spam, while you set daily volume, send windows and ramp speed. It then shows where mail lands at each provider as the ramp runs, and it works with any sending platform without migration.
Every plan includes the IA Score and IA Reputation ratings, adaptive autowarmup, placement testing, live blacklist monitoring, DMARC reporting, a full REST API and a dedicated CSM. The free warmup planner returns a day-by-day schedule for a target volume without signup, which is useful even if you buy elsewhere. The price is aimed at serious senders: Starter is $149 a month for 100 seed emails a day and one sender profile, and Plus is $645 for five. For a few cold inboxes, that is hard to justify.
Standout feature
Its free warmup planner returns a day-by-day ramp schedule with no signup.
Use cases
Email marketing agencies
Recover Google domain reputation for a client
Outcome: Placement tracked by provider during the ramp
Outbound teams
Plan a ramp schedule with the free planner
Outcome: A day-by-day volume plan before sending
Key features
- Engagement from real mailboxes: opens, replies, marked important, rescued from spam
- Adaptive autowarmup with user-set volume, send windows and ramp speed
- Inbox placement testing and live blacklist monitoring
- IA Score and IA Reputation sender ratings
- DMARC reporting, full REST API and HubSpot and Klaviyo integrations
Pros
- Works with any sending platform, nothing to migrate
- Free warmup planner gives a day-by-day ramp
- Dedicated CSM on every plan
Cons
- Starter covers only 1 sender profile
- Much higher price than cold email warmup tools
- Phone support and strategy sessions start at $1,190 a month
Rank 10
Folderly
A sales-led deliverability service for B2B teams with daily placement monitoring, spam trigger detection and expert guidance, priced per mailbox.
folderly.com7.1
out of 10
Best for: B2B sales organizations that want managed deliverability rather than a self-serve warmup tool.
Folderly argues against plain warmup and sells a broader deliverability service to B2B teams. The core product runs daily inbox monitoring, sends automated tests from a chosen mailbox and template, reports placement across major providers, and detects the technical and content triggers that push mail to spam at Gmail and Outlook. It also replies to emails, checks DNS records with setup support, reviews inbox versus Promotions placement and gives IP insights with sender score and blacklist data, all backed by practical guidance from its deliverability team.
Pricing is per mailbox on yearly billing: $96 for one to nine mailboxes, $72 for 10 to 24 and $56 for 25 to 99, with a minimum commitment and a demo required to start. The separate Inbox Insights tester has a free tier with two tests a month and Pulse alerts are free. For teams that just need fresh inboxes warmed, this is far more service and cost than necessary.
Standout feature
It detects the specific technical and content triggers behind spam placement at Gmail and Outlook.
Use cases
Enterprise SDR teams
Diagnose why Outlook keeps filtering outbound mail
Outcome: Specific technical and content fixes
Lead generation firms
Monitor placement daily across 25 or more mailboxes
Outcome: Volume pricing of $56 per mailbox
Key features
- Daily inbox monitoring with placement reports across major providers
- Detection of technical and content spam triggers in Gmail and Outlook
- Replies to emails and single-click mailbox connection
- IP insights with sender score and blacklist information
- Domain health checks with step-by-step fix guides
Pros
- Explains why mail lands in spam, not only where
- Per-mailbox price drops to $56 at 25 or more mailboxes
- Free Pulse alerts and a free tier of Inbox Insights tests
Cons
- Most expensive per mailbox on this list
- Sales-led: you request a demo to start
- Minimum commitment applies
Frequently asked questions
+What is the best email warmup tool in 2026?
Instantly is our top pick for outbound teams because every Outreach plan includes unlimited email accounts and unlimited warmup, from $37.60 a month billed yearly. TrulyInbox is the best warmup-only tool, priced by daily warmup emails from $22 a month billed yearly.
+How long should I warm up a new domain before cold emailing?
Plan on two to four weeks. Warmbox says first results usually take 15 to 30 days of uninterrupted warming, and Mailwarm says stronger placement typically builds over 2 to 4 weeks. Keep warmup running after the campaign starts.
+Is there a free email warmup tool?
TrulyInbox has a free plan for one account with 10 warmup emails a day and no credit card. lemwarm is included free with every lemlist plan, and Instantly and Smartlead include warmup in their paid sending plans.
+Which warmup tools do not charge per inbox?
Instantly and Smartlead include warmup for unlimited mailboxes in their cold email plans, and TrulyInbox charges for total daily warmup emails across unlimited accounts. MailReach, lemwarm, Mailwarm and Folderly charge per mailbox.
+How many warmup emails should I send per day?
TrulyInbox recommends a 2:1 ratio, two warmup emails for every cold email each day, so an inbox sending 50 cold emails should get about 100 warmup emails. Instantly's slow ramp starts at two warmup emails and adds two per day.
About this list
Updated November 9, 2026 by the Mojolin research desk. Mojolin is self-funded
Questions or corrections: editorial@mojolin.com
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