Best Email Warmup Tools for 2026: 12 Picks Ranked by What You Need
Compare the 12 best email warmup tools for 2026 on price, warmup networks and deliverability features, with every price checked November 6, 2026.
Shamim Mia, Founder, SerpAstraLast verified November 6, 202613 min readWe compare pricing pages, documentation and public reviews. We never accept payment for rankings.
Key takeaways
- Lemwarm is the best dedicated warmup for most senders at $29/month per email; Warmbox follows at $19/month, and Warmup Inbox has the only free warmup plan here.
- If you also send the campaigns, Instantly ($47/month) and Smartlead ($39/month) include unlimited warmup, so you pay nothing extra per inbox.
- The single most important buying factor is the unit you are charged for: per email, per inbox, or bundled into an outreach platform. That unit decides what five inboxes actually cost.
- Warmup fixes sender reputation, not list quality or copy. Bad lists and spammy subject lines will still land in spam, however long you warm up.
On this page
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|---|---|---|
| Lemwarm | Solo senders warming a single new inbox before their first cold campaign | $29/mo | No |
| Warmbox | Solo senders who want the cheapest dedicated warmup with human-like emails | $19/mo | No |
| Warmup Inbox | Senders who want a free warmup tier now and a cheap paid plan per inbox | $19/mo | Yes (free plan) |
| Instantly | Cold emailers who want warmup bundled into the same tool that sends the campaigns | $47/mo | No |
| Smartlead | Agencies and sales teams warming many mailboxes for multiple clients | $39/mo | No |
| Snov.io | Small teams that want prospecting, verification, sending and warmup in one subscription | $39/mo | Yes (free plan) |
| SalesHandy | Outbound teams that want warmup on unlimited mailboxes without per-inbox fees | $41/mo | No |
| Mailwarm | Teams that want a deliverability expert on call, not just a warmup dashboard | $79/mo | No |
| Woodpecker | Cold emailers who want free warmup slots inside a sender built for deliverability | $39/mo | No |
| GMass | Gmail users who send mail merges and want spam protection inside the inbox | $29.95/mo | Yes (free plan) |
| Folderly | Teams that want a full deliverability suite, not just a warmup tool | $96/mo | No |
| GlockApps | Senders who want to test placement and watch DMARC before and during warmup | $59/mo | Yes (free plan) |
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Request a listingThe best email warmup tools
Lemwarm
Best for: Solo senders warming a single new inbox before their first cold campaign
Lemwarm is the most focused tool in this list: it does warmup and nothing else. Essential costs $29 a month per email, or $24 a month billed annually, and buys automatic warmup across a network of more than 20,000 healthy domains, plus deliverability reports and a technical setup check that flags authentication problems before you send.
The catch is the per-email pricing. Warming one inbox is cheap, but a five-inbox setup costs $145 a month on Essential, and the cheapest plan skips the personalized emails and industry-matched warmup. Buy Lemwarm when you have one or two inboxes to warm; buy Instantly or Smartlead when warmup is one part of a bigger sending operation.
What we like
- A dedicated warmup network of more than 20,000 healthy domains
- Automatic warmup with deliverability reports and a technical setup check
- Lets you warm up your real email templates, not just generic messages
- Smart plan adds personalized warmup emails and custom deliverability alerts
Watch out for
- Priced per email, so warming five inboxes costs five subscriptions
- No free plan and no free trial listed on the pricing page
- The cheapest plan lacks personalized warmup emails and industry-matched warmup
Warmbox
Best for: Solo senders who want the cheapest dedicated warmup with human-like emails
Warmbox is the cheapest dedicated warmup in this list, and it does not feel cheap. Solo costs $15 a month for one inbox at 50 warmup emails a day, with GPT-4-written emails that read like real correspondence, spam-score monitoring, and automatic removal of warmup emails from the spam folder when they land there.
The limits are the volume and the headcount. One inbox and 50 emails a day suit a single sender, but a team warming three inboxes needs Start-up at $69 a month, and six inboxes need Growth at $139. Buy Warmbox when one inbox and a tight budget are the whole brief.
What we like
- Cheapest dedicated warmup here at $15 a month for one inbox
- Human-like warmup emails written with GPT-4, plus spam-score monitoring
- Auto-removes its own warmup emails from spam and auto-replies to them
- Free IP blacklist and DNS checker included for every visitor
Watch out for
- Entry plan warms one inbox at 50 emails a day, so volume senders pay more
- No free plan and no free trial listed on the pricing page
- The page does not state a monthly-billing price, only the $15 figure shown
Warmup Inbox
Best for: Senders who want a free warmup tier now and a cheap paid plan per inbox
Warmup Inbox is the only tool here with a genuinely free warmup plan: unlimited inboxes at 15 warmup emails a week, with basic reports and no card required. Basic costs $15 a month per inbox on annual billing and raises the volume to 75 warmup messages a day across a network of more than 30,000 real inboxes, with spam and category monitoring included.
The price to watch is the per-inbox unit. Five inboxes cost $75 a month on Basic, and monthly billing costs more than the $15 shown, since annual billing saves 20%. Start on the free plan to test the network, then pay for Basic the week your first campaign is scheduled.
What we like
- The only free warmup plan here: 15 warmup emails a week, unlimited inboxes
- Basic is $15 a month per inbox with 75 warmup messages a day
- Warmup network of more than 30,000 real inboxes with spam monitoring
- Per-inbox price falls as you add inboxes, and agencies get white-label reports
Watch out for
- Per-inbox pricing means a five-inbox setup costs $75 a month on Basic
- Annual billing saves 20%, so monthly billing costs more than the $15 shown
- Higher reply rates and custom warmup settings wait for Pro at $49 a month
Instantly
Best for: Cold emailers who want warmup bundled into the same tool that sends the campaigns
Instantly is the best warmup value if you send cold email, because warmup is unlimited and included: every plan warms as many email accounts as you connect, at no extra cost. Growth costs $47 a month, or $37.60 a month billed annually, and adds 5,000 emails a month, 1,000 uploaded contacts, a 450-million-contact lead database and a built-in CRM.
The trade-off is that you buy the whole platform to get the warmup, and reviewers report that the most premium warmup pool needs the $500-a-month Agency plan. Buy Instantly when warmup and sending belong in one login; buy Lemwarm or Warmbox when you already have a sender you like.
What we like
- Unlimited email warmup on every plan, with unlimited email accounts
- Rated 4.8 out of 5 on G2 across 4,165 reviews
- Warmup, sending, lead data and a built-in CRM live in one subscription
- Reputation protection and bounce detection run on every campaign
Watch out for
- Warmup is bundled, so you pay for the whole outreach platform to get it
- The most premium warmup pool needs the $500-a-month Agency plan, reviewers say
- Done-for-you domains bought inside Instantly cannot be transferred out, reviewers report
Smartlead
Best for: Agencies and sales teams warming many mailboxes for multiple clients
Smartlead is built for volume: every plan includes unlimited email accounts, so warming forty mailboxes costs the same as warming one. Base costs $39 a month and covers 2,000 contacts, 6,000 email sends and 2,000 verified prospect emails, with a built-in warmup pool, mailbox rotation and a master inbox that gathers replies from every mailbox in one place.
The gaps sit on the Base plan itself. CRM access is not included, white-label client workspaces cost $29 a month each, and reviewers say the interface takes time to learn. Buy Smartlead when you run outbound for clients or across many domains; buy Instantly when a single team needs the simpler setup.
What we like
- Unlimited email accounts on every plan, so warmup never costs per inbox
- Rated 4.5 out of 5 on G2 across 470 reviews
- Built-in warmup pool with mailbox rotation and a master inbox for replies
- Annual billing saves 17% across all four plans
Watch out for
- No free plan, and CRM access is not included on the Base plan
- White-label client workspaces cost $29 a month each on top of the plan
- Reviewers say the interface has a learning curve and some billing is unclear
Snov.io
Best for: Small teams that want prospecting, verification, sending and warmup in one subscription
Snov.io is the broadest value pick here: one subscription covers lead finding, email verification, sending and warmup. Starter costs $39 a month, or $29.25 a month billed annually, and includes 1,000 credits, 5,000 recipients, unlimited team seats and three email warmups with unlimited warmup volume, a premium pool and GPT-4o mini warmup emails.
The limit to watch is the warmup count. Three mailboxes suit a small team, but unlimited warmups need Pro at $74.25 a month, and the separate credits and recipients counters take care to follow. Buy Snov.io when prospecting and warmup should live in one tool; buy a dedicated warmup tool when you already own your lead data.
What we like
- Warmup is included on every paid plan, with a premium pool and GPT-4o mini emails
- Rated 4.5 out of 5 on G2 across 499 reviews
- Starter includes 1,000 credits, 5,000 recipients and unlimited team seats
- Specific-provider warmup targets the inbox that is actually underperforming
Watch out for
- Starter warms only 3 mailboxes at once; unlimited warmups need Pro at $74.25 a month
- Credits and recipients are separate counters, so the plan math takes care to follow
- LinkedIn automation slots cost $69 a month each on top of the plan
SalesHandy
Best for: Outbound teams that want warmup on unlimited mailboxes without per-inbox fees
SalesHandy treats warmup as infrastructure, not an add-on: every plan lets you connect and warm up unlimited mailboxes at no extra cost, with adjustable warmup volume, ramp-up speed and reply rates. Starter costs $41 a month, or $34 a month billed annually, and covers 2,000 active prospects, 6,000 emails a month and 1,500 lead credits.
The catch is the seat and the speed. Starter covers one user, so a team of ten needs Pro at $99 a month, and the warmup daily limit is lower on the cheapest tier. Buy SalesHandy when you warm many mailboxes on a small team; buy Smartlead when client workspaces are the priority.
What we like
- Connect and warm up unlimited mailboxes at no extra cost on every plan
- Warmup volume, ramp-up speed and reply rates are all adjustable
- Ships with pre-configured mailboxes and domains, SPF, DKIM and DMARC included
- Built-in lead finder covers 852 million contacts with verification included
Watch out for
- Starter covers one user only; a team of ten needs Pro at $99 a month
- Warmup daily limits scale with the plan, so the cheapest tier warms slowly
- Lead data credits are metered separately from the warmup and sending limits
Mailwarm
Best for: Teams that want a deliverability expert on call, not just a warmup dashboard
Mailwarm sells guidance as much as software: every plan includes deliverability expert calls and an account manager who helps set up SPF, DKIM and DMARC. Starter costs $79 a month, or $69 a month billed annually, for one mailbox at up to 50 warmup emails a day, across a network of more than 50,000 real inboxes with spam-score monitoring.
The price is the honest problem. At $79 per mailbox per month, five inboxes cost $395 a month, and there is no free trial to test the network first. Buy Mailwarm when deliverability is a business problem worth expert help; buy Warmbox when a dashboard and a network are enough.
What we like
- Every plan includes deliverability expert calls and an account manager
- Warmup runs across 50,000-plus real inboxes with spam-score monitoring
- Provider-level warmup lets you target Gmail, Outlook or Microsoft 365 specifically
- Authentication fix tools for SPF, DKIM and DMARC are built in
Watch out for
- No free trial and no free plan, so the first month is a paid test
- Starter covers one mailbox, so a team pays $79 per inbox per month
- The most expensive dedicated warmup here by a wide margin
Woodpecker
Best for: Cold emailers who want free warmup slots inside a sender built for deliverability
Woodpecker builds warmup into the sender: every plan includes free warmup slots, inbox rotation, a deliverability monitor and adaptive sending that ramps volume gradually. The Email plan starts at $39 a month for up to 5,000 emails sent, with three warmups included, unlimited contacts storage, unlimited email verification and unlimited team members.
One honest caveat: the vendor's own pricing page did not render prices when we checked on November 6, 2026, so the $39 figure comes from an independent check of the same page (ToolsGavel, October 30, 2026). Buy Woodpecker when deliverability features matter more than prospecting data.
What we like
- Every plan includes free warmup slots, inbox rotation and a deliverability monitor
- Adaptive sending and human-like sending randomization protect new domains
- Unlimited team members and unlimited email accounts on every plan
- 14-day free trial with all features included and no credit card required
Watch out for
- The $39 price was not on the vendor's own page when we checked, so it is third-party-sourced
- Extra warmups beyond the included slots are a paid add-on
- Pricing is by emails sent, so heavy volume pushes you up the ladder fast
GMass
Best for: Gmail users who send mail merges and want spam protection inside the inbox
GMass is the Gmail-native option in this list, and the only one that works entirely inside the Gmail interface. Standard costs $29.95 a month, or $20 a month billed annually, and covers unlimited emails, unlimited contacts and unlimited campaigns, with mail merge personalization, free email verification and a Spam Solver that checks campaigns for spam triggers before sending.
Be clear about what it is not: GMass has no warmup network, so it cannot build sender reputation the way Lemwarm or Warmbox can. It belongs here as the cheapest Gmail companion to a real warmup tool. Buy it when you live in Gmail; pair it with Warmbox when your domain is new.
What we like
- Works inside Gmail with unlimited emails and unlimited contacts on every plan
- Spam Solver checks every campaign for spam triggers before it sends
- Free email address verification is included on the Standard plan
- Annual billing drops Standard to $20 a month, or $249 a year
Watch out for
- Works inside Gmail only, so Outlook and Microsoft 365 senders cannot use it
- No warmup network: it checks spam triggers but does not build sender reputation
- Sequences, A/B testing and inbox rotation wait for Professional at $59.95 a month
Folderly
Best for: Teams that want a full deliverability suite, not just a warmup tool
Folderly is the suite play: instead of a single warmup tool, it pairs sender reputation maintenance with inbox placement testing, ongoing monitoring and AI campaign drafting. The main product costs $96 a month per mailbox on yearly billing, and Inbox Insights checks placement, IPs and DNS before a campaign launches, with two free tests a month.
The price and the packaging are the trade-offs. At $96 per mailbox it is the most expensive entry price here, and the suite is split across products, so one plan does not buy everything. Buy Folderly when email is a core revenue channel and the whole deliverability stack matters.
What we like
- A full suite: sender reputation maintenance, inbox placement tests and monitoring
- Inbox Insights checks placement, IPs and DNS before a campaign launches
- AI campaign drafting sits beside the deliverability checks in one suite
- Case studies report open rates rising from 4% to 70% after fixes
Watch out for
- $96 a month per mailbox is the most expensive entry price in this list
- No free plan for the main product, and no free trial listed
- The suite is split across products, so one plan does not include everything
GlockApps
Best for: Senders who want to test placement and watch DMARC before and during warmup
GlockApps is the testing companion to every warmup tool in this list: it does not warm inboxes itself, but it tells you whether the warmup is working. The free plan includes 2 spam test credits and DMARC analytics for 10,000 messages; Essential costs $59 a month and adds 360 spam test credits, DMARC for 600,000 messages and IP reputation monitors.
Buy it alongside a warmup tool, not instead of one. Run a placement test before you warm up, another after two weeks, and a third the day your first campaign goes out. The three tests together show whether the warmup moved the needle or just moved the calendar.
What we like
- Free plan includes 2 spam test credits and DMARC analytics for 10,000 messages
- Essential adds 360 spam test credits a month and DMARC for 600,000 messages
- Uptime and IP reputation monitors watch the infrastructure behind your sending
- One subscription covers multiple domains and mailboxes for testing
Watch out for
- No warmup network of its own: it tests and monitors, it does not warm inboxes
- Paid plans start at $59 a month for what is mainly a testing tool
- DMARC analytics on the free plan are capped at 10,000 messages
The best email warmup tools do one job: they build a new domain's sender reputation before it sends real campaigns, by exchanging emails with a network of real inboxes that open, reply and mark messages as important. We ranked the twelve tools below by fit for the most common buyer — a sender warming a new domain before a cold campaign — starting with the dedicated warmup tools and ending with the testing tools that prove the warmup worked, and every price was checked on the vendor's own pricing page on November 6, 2026, except Woodpecker, whose price is third-party-sourced and flagged below.
How to choose the best email warmup tools
- Count the billing unit first. Lemwarm charges per email, Warmbox and Warmup Inbox per inbox, and Instantly and Smartlead bundle warmup into an outreach platform. Five inboxes cost $145 a month on Lemwarm, $75 on Warmup Inbox, and nothing extra on Instantly.
- Check the network, not just the price. A warmup tool is only as good as the inboxes it exchanges with: Lemwarm cites more than 20,000 domains, Warmup Inbox more than 30,000 real inboxes, and Mailwarm more than 50,000.
- Decide whether you need a sender too. If you already send from a platform you like, buy a dedicated warmup tool. If you need the sender as well, Instantly, Smartlead, Snov.io or SalesHandy include warmup in the same subscription.
- Look for the controls that matter. Adjustable ramp-up speed, reply rates, provider-level warmup and spam-score monitoring decide whether the warmup actually moves your placement, not just your activity log.
- Plan the test, not just the warmup. A placement test before and after warmup proves the money worked. GlockApps runs those tests, and its free plan covers the first two.
Warmup is one system in your outreach stack, not the whole stack. If the domain is warmed but nobody finds your site, our AI search optimization service covers the visibility side. And before you publish new pages for the services you sell, run your titles through the free SERP snippet preview tool — it shows exactly how the title and description will look in Google.
Whatever you shortlist, start the warmup at least two weeks before your first campaign. Connect the inbox, set the daily volume low, and let it ramp gradually while you write the campaign and clean the list. Check two things during the trial: that warmup emails are landing in the inbox rather than spam, and that your SPF, DKIM and DMARC records pass. Every tool here either checks authentication for you or ships with the records pre-configured, so there is no reason to send a real campaign before the setup check is green.
Email warmup tools pricing: what you will actually pay
Take a sender warming five inboxes for a month before a cold campaign. On list prices, the dedicated tools cost $95 a month on Warmbox (five Solo plans at $19) or Warmup Inbox (five inboxes at $19), $145 on Lemwarm (five emails at $29), $395 on Mailwarm (five mailboxes at $79), and $480 on Folderly (five mailboxes at $96). The bundled platforms cost nothing extra for the warmup itself: Instantly Growth at $47 a month, Smartlead Base at $39, Snov.io Starter at $39 and SalesHandy Starter at $41 all warm as many mailboxes as you connect, within their plan limits.
Over a year, that is $900 on Warmbox or Warmup Inbox, $1,740 on Lemwarm, $4,740 on Mailwarm and $5,760 on Folderly for five inboxes, against $564 a year on Instantly Growth billed annually, $468 on Smartlead Base, $468 on Snov.io Starter billed annually and $492 on SalesHandy Starter billed annually — but those four also buy the sending platform, the lead data and the CRM, so the comparison is not like for like. The cheapest honest buy for warmup alone is Warmbox or Warmup Inbox; the cheapest honest buy for warmup plus sending is Snov.io or Smartlead.
Two costs sit outside every number above. First, the sending infrastructure: SalesHandy sells pre-configured mailboxes from $2.99 a month each on annual billing, and Instantly sells done-for-you domains, so a new domain setup adds a few dollars per mailbox either way. Second, the placement tests: GlockApps Essential at $59 a month covers 360 spam test credits, and its free plan covers the first two tests, so budget at least one test before warmup and one after.
Know the difference: email warmup vs inbox placement testing
The confusion in this category is between the treatment and the checkup. Email warmup builds sender reputation over weeks: the tool exchanges emails with a network of real inboxes that open, reply, mark messages as important and rescue them from spam, so mailbox providers learn to trust the new domain. Inbox placement testing checks where one message lands right now: it sends a test email to a seed list and reports how many copies reached the inbox, the promotions tab and spam.
A tool can do one without the other. Lemwarm, Warmbox, Warmup Inbox and Mailwarm warm inboxes but do not run placement tests; GlockApps and Folderly's Inbox Insights test placement but run no warmup network. The bundled platforms do a little of both: Instantly, Smartlead and Snov.io warm inboxes and check deliverability, but their tests are lighter than a dedicated testing tool.
The practical rule is to use both. Warm up for two to four weeks, run a placement test before the first campaign, and run another test if open rates drop. If placement is still poor after a full warmup, the problem is usually the list, the copy or the authentication records, not the warmup tool — and no amount of extra warming fixes a list full of bad addresses.
Quick comparison: tool type by need
| Buyer | Best pick | Why |
|---|---|---|
| Solo sender, one new inbox | Lemwarm | Dedicated warmup network, from $29/month per email |
| Tightest budget | Warmbox | Cheapest dedicated warmup, $19/month for one inbox |
| Free plan first | Warmup Inbox | Free plan with 15 warmup emails a week, then $19/month per inbox |
| Warmup plus sending | Instantly | Unlimited warmup included, Growth is $47/month |
| Agency, many mailboxes | Smartlead | Unlimited email accounts, Base is $39/month |
| Expert help included | Mailwarm | Deliverability expert on every plan, from $79/month |
| Prove it worked | GlockApps | Placement tests and DMARC, free plan included |
Mistakes to avoid
- Buying on the headline price without counting the billing unit. A $15 tool charged per inbox costs $75 a month for five inboxes, and a $29 tool charged per email costs $145. Count the inboxes first, then compare prices.
- Launching the campaign in week one. Warmup needs two to four weeks to move sender reputation. Sending at full volume on day three burns the domain the warmup was supposed to protect.
- Warming a domain with broken authentication. SPF, DKIM and DMARC must pass before warmup starts. Every tool here checks them or ships them pre-configured — run the check and fix what it flags.
- Confusing activity with deliverability. A warmup dashboard full of sent emails proves nothing on its own. Run a placement test before the first campaign and judge the warmup by where real messages land.
- Warming up and then sending to a dirty list. Bounces and spam complaints undo weeks of warmup in a day. Verify the list before the first send, and keep the bounce rate under 2%.
How we chose
We checked each vendor's own pricing page on November 6, 2026 and recorded the starting price exactly as shown, including the annual-billing figure where the page lists one, and we ranked the tools by fit for the most common buyer — a sender warming a new domain before a cold campaign — not by brand size. One price is not vendor-verified: Woodpecker's pricing page did not render its prices when we checked, so its $39 a month comes from an independent check of the same page (ToolsGavel, October 30, 2026) and is flagged as third-party-sourced. Ratings appear only for the three tools whose G2 pages we opened and read on November 6, 2026 — Instantly, Smartlead and Snov.io. G2 rate-limited further checks, so the other nine tools carry no rating here rather than a stale or estimated one. No vendor paid for a place in this list, and none of the links here are affiliate links.
What to do next
Start with the free plan or trial of your top pick and warm the inbox for at least two weeks before your first campaign. Run a placement test before you send, and check that your authentication records pass while the warmup runs. If the domain is warmed but new customers are not finding you, compare providers in our guide to the best email deliverability services or the best cold email software. Once your tools are in place, find out what's holding your rankings back.
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Get a free audit→Sources we checked (16)
- Lemwarm pricing — lemwarm.com/pricing (checked November 6, 2026)
- Warmbox pricing — warmbox.ai/pricing (checked November 6, 2026)
- Warmup Inbox pricing — warmupinbox.com/pricing (checked November 6, 2026)
- Instantly pricing — instantly.ai/pricing (checked November 6, 2026)
- Instantly reviews — g2.com/products/instantly/reviews (checked November 6, 2026)
- Smartlead pricing — smartlead.ai/pricing (checked November 6, 2026)
- Smartlead reviews — g2.com/products/smartlead/reviews (checked November 6, 2026)
- Snov.io pricing — snov.io/pricing (checked November 6, 2026)
- Snov.io reviews — g2.com/products/snovio/reviews (checked November 6, 2026)
- SalesHandy pricing — saleshandy.com/pricing (checked November 6, 2026)
- Mailwarm pricing — mailwarm.com/pricing (checked November 6, 2026)
- Woodpecker pricing — woodpecker.co/pricing (checked November 6, 2026; prices did not render)
- Woodpecker pricing, independent check — toolsgavel.com/tools/woodpecker (verified October 30, 2026)
- GMass pricing — gmass.co/pricing (checked November 6, 2026)
- Folderly pricing — folderly.com/pricing (checked November 6, 2026)
- GlockApps pricing — glockapps.com/pricing (checked November 6, 2026)
Shamim
Founder of SerpAstra
A full-stack SEO and digital marketer who spends most days on Local SEO for dental practices, AI search visibility and lead generation.
Frequently asked questions
What is the best email warmup tool?
Lemwarm is the best dedicated warmup for most senders at $29 a month per email, with a network of more than 20,000 domains. Warmbox is the cheapest dedicated option at $19 a month. If you also send the campaigns, Instantly includes unlimited warmup from $47 a month.
How much do email warmup tools cost?
Dedicated warmup tools cost $19 to $96 a month per inbox. Warmbox and Warmup Inbox start at $19 a month, Lemwarm at $29, and Mailwarm at $79. Outreach platforms bundle warmup in: Instantly from $47 a month, Smartlead from $39, and Snov.io from $39.
Is there a free email warmup tool?
Yes. Warmup Inbox has a free plan with 15 warmup emails a week across unlimited inboxes. Snov.io has a free plan with one email warmup, and GlockApps has a free plan with two spam test credits. Most dedicated warmup tools have no free plan, only a trial.
How long does email warmup take?
Plan on two to four weeks of continuous warmup before a new domain sends at full volume. Mailwarm says stronger inbox placement typically builds over two to four weeks. Start slow, raise the daily volume gradually, and do not launch a large campaign in the first week.
What is the difference between email warmup and inbox placement testing?
Warmup builds sender reputation by exchanging emails with a network of real inboxes over weeks. Placement testing checks where one message lands right now. Warmup is the treatment, testing is the checkup. Use both: warm up with Lemwarm or Warmbox, and test with GlockApps.
Do I still need warmup if I use Instantly or Smartlead?
No, not as a separate purchase. Both include warmup: Instantly gives unlimited warmup on every plan, and Smartlead includes a warmup pool with unlimited email accounts. A separate warmup tool only makes sense if you send from a platform that has no warmup built in.
Can I warm up a Gmail or Outlook inbox?
Yes. Every dedicated tool here supports Gmail and Google Workspace, and most support Outlook and Microsoft 365. Mailwarm offers provider-level warmup for Gmail, Outlook and Microsoft 365, Snov.io offers specific-provider warmup for the inbox that is underperforming, and Warmup Inbox supports Gmail, Outlook and other SMTP inboxes.
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