Free Email Warmup Tools: 10 Free Plans, Trials and Paid Options

Only two standalone warm-up tools in this comparison state a free-forever plan: BobWork Email Warm-up and TrulyInbox. Treating a 7-day trial as a free plan can stop your ramp before the 14-day baseline for an existing domain. This guide separates ongoing free access, capped free tiers, trials and paid-only tools.

If you want the shorter buyer guide, start with our best free email warm-up tool comparison. This page goes narrower: it sorts tools by what you can actually use without paying, how long access lasts and what limits apply.

How did we sort the tools?

The method is simple: compare what a new user can start with, then sort by permanence.

Prices were read on 3 October 2026 from vendor pricing pages; check before you buy. Free-tier details were checked again on 4 October 2026 where the vendor page had changed.

Sorting order:

1. Free forever, with no time limit.
2. Free forever, but tightly capped.
3. Trial only.
4. No trial or paid only.

A tool appears first only when the table supports it. Among standalone warm-up tools, only TrulyInbox, with 1 account and 10 emails per day, and BobWork Email Warm-up, with up to 20 mailboxes and 3-30 emails per day each, offer a free-forever plan; every other tool here is a trial or paid.

This list does not score inbox placement. No vendor can guarantee it. You still need SPF, DKIM, DMARC, low complaints and sane sending volume. If you need the mechanics first, read how an email warm-up network works.

Which free email warmup tools are actually free?

The practical split is not free versus cheap. It is free forever versus trial access. A 7-day trial can help you test setup, but it does not cover a conservative 14-day warm-up for an existing domain.

The second split is pool type. Shared or peer networks send warm-up mail between customer or vendor-controlled mailboxes. A private pool sends only between mailboxes you connect. We explain the risk trade-off in private warm-up pools vs public networks.

What do the free-forever tools include?

BobWork Email Warm-up

BobWork Email Warm-up is free, requires no credit card, has no time limit and supports up to 20 mailboxes per account.

It fits teams with one or more supported mailboxes. By default they warm in the shared network; switch the account to Private pool and only your own mailboxes write to each other.

Provider support is broad, but not universal. BobWork supports Gmail and Google Workspace, Zoho Mail, Lark Mail, Yahoo Mail, iCloud Mail, Amazon SES, SendGrid, Mailgun and any IMAP+SMTP mailbox. Outlook and Microsoft 365 are not supported yet because Microsoft requires OAuth.

Gmail can connect through Google sign-in or IMAP with an app password. Google shows an unverified-app notice because BobWork has not completed the CASA audit.

The engine starts at 3 emails per day, adds 2 per day and caps at 30 per day by default. The cap is editable per mailbox up to 100. During campaigns, keep warm-up around 10-15 per day and real outreach at 30-50 per mailbox.

TrulyInbox

TrulyInbox states a free-forever plan with 1 email account, 10 warm-up emails per day, basic deliverability tracking and no credit card.

It fits a solo sender testing one mailbox. The 10-per-day cap is enough for light activity, but it is narrow if you manage several sending inboxes.

The paid Starter plan is listed at $22 per month annually or $29 monthly. For this comparison, the key fact is the free plan: it is ongoing, but capped to 1 account.

Which tools are trials only?

Warmup Inbox

Warmup Inbox has no free plan. It offers a 7-day no-card trial, and Basic costs $15 per inbox per month annually or $19 monthly.

Its pricing page states 75 warm-up messages per day on Basic and a vendor-run network of 30,000+ real inboxes. Use the trial to test connection, reporting and fit. Do not treat 7 days as a complete warm-up cycle.

Mailivery

Mailivery has no free plan. It offers a 7-day trial, and Starter is listed at $29 per month.

It fits buyers who want peer-to-peer warm-up between customers before choosing a paid plan. The pricing page states Microsoft 365 support, but wider provider detail is not stated on that page.

Warmbox

Warmbox has no free plan. It lists a no-card trial, but the trial length is not stated. Solo is listed at $15 per month yearly or $19 monthly.

The page states a vendor-run pool of 35,000+ private inboxes. Provider coverage is not stated on the pricing page, so verify your mailbox type before setup.

Lemwarm

Lemwarm has no standalone free plan. Essential is listed at $24 per month annually or $29 monthly per email account.

It fits lemlist users who want warm-up inside that ecosystem. Vendor pages mention Gmail and Outlook one-click setup, plus Zoho, FastMail, Proton and SMTP.

Trial information is not clean. One help page says 14 days, while another says lemwarm is not in the lemlist trial. Treat standalone warm-up as paid unless the vendor confirms otherwise.

Warmy

Warmy has no free plan. It offers a 7-day no-card trial and lists pricing from $49 per month, while tier prices were not readable on the page.

It fits users who want broad provider coverage claims and a large shared pool. The vendor states over 1 million mailboxes and 35+ listed providers, including Gmail, Outlook, Zoho, SES, Mailgun and SendGrid.

Ask for the current plan or per-mailbox price before comparing it with lower-cost tools. Missing tier detail changes the real cost quickly.

Instantly

Instantly has no free plan. Its trial states 250 contacts, 1,000 emails, warm-up from day one and account deletion if not upgraded. The trial length is 14 days.

It fits teams that want outreach software with warm-up bundled, not a standalone warm-up-only tool. Growth is listed at $47 per month.

The pool is made of customer accounts, and the vendor states 4.2M+. If you only need warm-up, compare the whole outreach plan cost rather than the warm-up feature alone.

Which tools have no warm-up trial?

MailReach

MailReach has no free plan and no trial. It offers a free spam test limited to 3 per 24 hours, and paid warm-up starts at $19.50 per mailbox per month.

It fits users who prefer a paid vendor-run network of Workspace and O365 inboxes. The vendor states up to 100 warming emails per day.

The free spam test is diagnostic. It is not a warm-up replacement. You cannot run a 14-day ramp on a 3-test-per-day checker.

Mailwarm

Mailwarm has no free plan and no traditional free trial. Starter is $69 per month for 1 mailbox.

It fits buyers who want a Mailwarm-operated pool and can justify the higher entry price. Starter states up to 50 warm-up emails plus 50 replies per day.

The pricing unit matters. Growth is listed at $159 for 3 mailboxes, and Scale is listed at $479 for 10 mailboxes. If you need several inboxes, calculate the plan cost before comparing it with per-mailbox tools.

What does a real warm-up require?

A trial is useful only if it covers the job you need done. For an existing domain, use 14 days as a practical baseline. For a new domain, 3-4 weeks is safer.

Mailbox providers do not reward volume alone. They look at authentication, engagement, complaints, bounces and sender behaviour. Google asks bulk senders to keep spam complaint rates below 0.1% and avoid ever reaching 0.3% in its email sender guidelines. Yahoo publishes similar expectations in its sender requirements.

Before any tool helps, your domain should have SPF, DKIM and DMARC. DMARC builds on SPF and DKIM alignment, as defined in RFC 7489. Check the basics with our SPF checker, DKIM checker and DMARC checker.

This is where trial length becomes concrete. A 7-day trial can confirm connection, sending, replies and dashboard basics. It cannot show whether a new domain survives three weeks of stable behaviour.

Measurement matters too. BobWork Email Warm-up measures spam landings directly inside receiving mailboxes. It does not use third-party seed lists. The free pool does this step automatically for warm-up mail carrying the engine hidden header, and real mail is not read, moved or answered.

If you are warming for the first time, use our day-by-day warm-up timeline before choosing a trial. It shows what should change in week one, week two and after launch.

How should you choose?

Start with the constraint that would make a tool fail for you. Do not start with the brand.

Use a free-forever tool when you need time. Use a trial when you mainly need to test the interface, connection flow or reporting. Use a paid-only tool when the provider mix, pool type or bundled outreach platform is worth the cost.

If Outlook is mandatory, BobWork is not the right fit today. Use a tool that states Outlook or Microsoft 365 support. If no time limit matters more, a free-forever network with a private-pool switch can be a better fit than a short trial.

Free does not mean careless. Warm-up mail should look like normal office email: plain text, no links, no images, short threads and realistic timing. It should not blast hundreds of messages from a new mailbox.

BobWork Email Warm-up follows that conservative pattern: 3 emails per day at the start, gradual ramping, randomised sending between 09:00 and 18:00 in the mailbox time zone, and weekend volume at 30%. Threads end after 3 messages, and about 40% of received warm-up mail gets a reply.

You can start with the free warm-up tool if you have at least 2 supported mailboxes and do not need Outlook yet. Expect the Google unverified-app notice on Gmail OAuth, or use supported app-password and IMAP paths where available. Keep the first 14 days boring, measured and slow.

Frequently asked questions