Email Warmup Tools: Building Reputation Before You Send
ZeroBounce ranks first of the fourteen tools on this email warmup tools grid, with 9.8 on deliverability impact on 70 tagged reviews. Warmup Inbox, whose own pages call it an email warmup tool, ranks second on 42 tagged reviews.
Every score on this page validated by the site owner · latest validation Oct 16, 2026 · How we score
The top three
Rank follows score, nothing else; the full table of 14 is below.
ZeroBounce scores 8.7 on 105 tagged reviews: ease of use draws 436 favourable mentions, while price level draws 170 negative mentions and credits and quotas 52.
Warmup Inbox scores 8.5 on 42 tagged reviews: support quality scores 9.6 on 31 tagged reviews and warm-up has 10 favourable mentions among 12, while stability draws 2 negative mentions among 3.
Emelia scores 8.3 on 7 tagged reviews: value for money scores 9.3 and ease of setup 8.9, while feature depth scores 7.4, with 3 of the 7 tagged reviews on it positive.
Highest-scored for your situation
One tool per situation: the highest-scored of the 14 whose reviews describe that situation. Each card names what it gives up.
ZeroBounce scores 8.7, the highest of the tools with team reviews, and 18 of its 105 tagged reviews come from teams; its Freemium plan lists 100 validation credits a month.
ZeroBounce scores 8.7, the highest of the tools with agency reviews, but only 6 of the 105 tagged reviews come from agencies; its pages list chat, email and phone support, 24/7.
Mailgun scores 7.6, the highest of the tools with solo reviews; only 3 of the 62 tagged reviews come from solo users, and its Free plan lists 100 emails a day.
All 14, side by side
Sorting reorders the table; it never changes a rank. Rank follows score, nothing else.
Sort by
| Rank | Tool | Score | Entry price | Trial | Best for | Actions |
|---|---|---|---|---|---|---|
| 1 | ZeroBounce |
8.7 | $99/mo | Team | ||
| 2 | Warmup Inbox |
8.5 | $19/inbox /mo | Team | ||
| 3 | Emelia |
8.3* | $37/mo | Team | ||
| 4 |  Mailtrap |
8.1* | $15/mo | |||
| 5 |  Email on Acid |
7.9* | $99/mo | Team | ||
| 6 |  EmailBison |
7.6* | $599/mo | |||
| 7 | Mailgun |
7.6 | From $15/mo | Team | ||
| 8 |  GMass |
7.5 | $29.95/mo | Team | ||
| 9 |  lemlist |
7.3 | $69/mo | Team | ||
| 10 |  Litmus |
7.3 | Not published | Team | ||
| 11 |  Instantly |
7.2 | $47/mo (billing period not stated) | Team | ||
| 12 |  SendGrid |
7.1 | From $19.95/mo | Team | ||
| 13 |  Smartlead |
7.0 | $39/mo | Team | ||
| 14 |  Woodpecker |
6.5 | $35/mo (billing period not stated) | Team |
Entry prices read on each vendor's public pricing page where one exists; the oldest reading dates from Sep 26, 2026. Some of these prices have not been read again for 6 months. Check the vendors' pages before you buy. * Under 10 tagged reviews: the score is weighted toward the site average; with none, it is the site average. How we score
The top six, in detail
The first six rows of the table, in rank order: what the reviews and the vendor's pages say about each one.
ZeroBounce scores 8.7 on 105 tagged reviews up to September 2026. Ease of setup scores 8.5 on 65 tagged reviews and support quality 9.2 on 46 tagged reviews, while feature depth is its lowest dimension at 7.4 on 77. Price level draws 170 negative mentions among 195, and credits and quotas 52 among 54.
- Ease of use: 436 favourable mentions, none negative
- Support quality scores 9.2 on 46 tagged reviews
- Price level draws 170 negative mentions among 195
- Credits and quotas draw 52 negative mentions
Warmup Inbox scores 8.5 on 42 tagged reviews up to September 2026. Ease of setup scores 8.4 on 20 tagged reviews and support quality 9.6 on 31, while feature depth scores 7.2 on 9 tagged reviews. Stability draws 2 negative mentions among 3 and price level 2 among 8. Basic is $19 per inbox a month, billed monthly, read on Oct 4, 2026.
- Support quality scores 9.6 on 31 tagged reviews
- Ease of setup scores 8.4 on 20 tagged reviews
- Feature depth scores 7.2 on 9 tagged reviews
- Stability draws 2 negative mentions among 3
Emelia scores 8.3 on 7 tagged reviews up to July 2025. Value for money scores 9.3, with all 7 tagged reviews on it positive, and support quality scores 8.5 on 5 tagged reviews. Feature depth scores 7.4, with 3 mixed among the 7 tagged reviews on it. Start is $37 a month. Prices were read on the vendor's page on Oct 4, 2026.
- Emelia's value for money scores 9.3 on 7 tagged reviews
- Unlimited email sending listed on every plan
- Emelia's feature depth scores 7.4 on 7 tagged reviews
- Start connects up to 3 mailboxes
Mailtrap lists a RESTful Email API and SMTP for transactional and bulk sending, read on Sep 26, 2026. Plans run from Free at $0 a month to Enterprise at $750 a month, and a fifth, for big senders, is quoted, read on Oct 4, 2026. Business adds a dedicated IP and 24/7 live chat. The site holds no tagged review counts for Mailtrap.
- Domain authentication and DKIM rotation built in
- Free plan with 4,000 emails and no credit card
- Business is $85 a month for 100,000 emails
- Basic caps domains at 5 and logs at 5 days
Email on Acid scores 7.9 on 8 tagged reviews up to April 2026. Ease of setup scores 9.0 on 3 tagged reviews, and results and time saved has 2 favourable mentions among 3. Price level draws 2 negative mentions, all of its mentions, and value for money scores 7.0 on 6 tagged reviews.
- Ease of setup scores 9.0 on 3 tagged reviews
- Results and time saved: 2 favourable mentions among 3
- Price level draws 2 negative mentions, none favourable
- Value for money scores 7.0 on 6 tagged reviews
EmailBison lists a single monthly Base Plan at $599, read on Oct 4, 2026, with 500,000 emails per month, unlimited leads, workspaces and teammates, and a dedicated Slack channel for support. Its sending runs on isolated infrastructure with dedicated IPs. The site holds no tagged review counts for EmailBison, and no free trial is stated on its pages.
- Isolated infrastructure with dedicated IPs and domain pools
- Unlimited leads, workspaces and teammates, no per-seat fees
- One plan only, at $599 a month
- Included volume is 500,000 emails per month
Beyond the scores
The sections below read where warmup sits: as a service of its own, inside sending plans, in reviewer mentions, and at the testing and sending tools whose pages list none.
Warmup Inbox and ZeroBounce list warmup as a service of its own
Warmup Inbox sells warmup as its product: its pages list automated warmup in 12 languages, read on Oct 4, 2026, and daily monitoring of 100+ blacklists, read on the same date. Its Pro plan adds topics you choose and warmup aimed at a specific email service provider, and its Max plan adds a technical setup check. Pro is $59 per inbox a month and Max is $99, both billed monthly and read on Oct 4, 2026; the price follows the number of inboxes you warm.
ZeroBounce lists domain and IP warmup for new and existing domains next to its email verification, read on Oct 4, 2026.
Sending platforms bundle warmup into their plans in different ways
Emelia lists email warmup in every plan and unlimited warmup on Grow and Scale; Grow is $97 a month billed monthly and connects up to 50 mailboxes, read on Oct 4, 2026. Instantly lists unlimited email warmup on its Growth and Hypergrowth plans, read on Sep 27, 2026. lemlist lists email warm-up with its deliverability hub on its Email plan, read on Oct 4, 2026, and Smartlead lists warm-up with automated DNS setup and sender rotation, read on Sep 27, 2026.
EmailBison lists email warm-up in its Base Plan, read on Sep 27, 2026, and Woodpecker lists warm-up as built in, read on Oct 4, 2026. Mailtrap lists a dedicated IP with automatic warm-up on its Business plan, read on Oct 4, 2026.
Review mentions of warm-up lean negative at Smartlead and Woodpecker
Vendor pages say what a tool lists; reviews say what users raised. Smartlead's tagged reviews, up to September 2026, carry 14 mentions of warm-up, 9 of them negative. Woodpecker's tagged reviews, up to August 2026, carry 5 mentions of warm-up, 4 of them negative. ZeroBounce's tagged reviews, up to September 2026, carry 3 mentions of warm-up, none negative. GMass's tagged reviews, up to September 2026, carry 4 mentions of warm-up, 1 negative and 2 favourable, and this page reads no warmup fact for GMass. EmailBison and Mailtrap have no tagged reviews on this page, so no review mentions of warm-up are read for them.
Litmus and Email on Acid test emails; SendGrid and Mailgun send them
This page reads no warmup fact for Litmus, Email on Acid, SendGrid or Mailgun; Litmus and Email on Acid describe email testing, SendGrid and Mailgun email sending. Litmus lists previews across 100+ email clients and spam testing across 25+ spam filters, read on Sep 26, 2026. Email on Acid lists previews across 100+ clients and devices and content spam analysis across major internet providers, read on the same date.
SendGrid lists a RESTful API and SMTP relay, with 50,000 to 100,000 emails a month on its Essentials plan. Mailgun lists batch sending of up to 1000 personalized emails per call, read on Sep 26, 2026.
Before you choose
This page compares tools and does not test warmup schedules, so it gives no length for a new domain. ZeroBounce's pages describe warming a new domain with a slow, gradual sending pace, or sending aggressively to repair a damaged sender reputation, read on Oct 4, 2026.
Here, the tools describe it in their own words. Warmup Inbox runs automated warmup across a network of 30,000+ real inboxes, EmailBison lists private, automated warmup pools, and Emelia says its warmup runs non-stop and is AI-powered, all read on Oct 4, 2026.
Here, free email warmup tools means warmup a vendor lists as free or offers in a trial, and this page does not test whether it is enough for one inbox. Woodpecker lists 2 warm-ups included free, and Warmup Inbox publishes a 7-day free trial with no credit card.
This page does not measure inbox placement, so it cannot say that warmup alone is enough. SendGrid lists email testing to check spam filters and rendering, read on Sep 27, 2026, and ZeroBounce lists inbox placement testing, while Warmup Inbox lists DNS, SPF, DKIM and blacklist checks built in.
This page does not recommend a daily volume; it reads what vendors publish. Warmup Inbox lists 75, 250 and 1,000 warmup messages a day on Basic, Pro and Max, ZeroBounce lists 250 warmup seeds a day on ZeroBounce ONE, and lemlist's guidance is one ceiling of 50 emails a day per mailbox for warm-up plus campaigns.
This page does not test built-in against standalone warmup, so it cannot say you need one. It reads two arrangements: Instantly, lemlist and Smartlead list warmup inside their platforms, while Warmup Inbox lists Mailgun, SendGrid and Amazon SES among the services whose sending it warms.
Where to go next
The pages this ranking links to: its category, neighbouring rankings and guides.
Affiliate linksThis page contains affiliate links: some vendors pay us a commission when you subscribe through their Try button. Scores come from public user reviews, on the same grid for every scored tool. Affiliate disclosure
Four dimensions only. The fifth changes with the category, so it would not compare.