Free Email Warm-Up Tools in 2026: Plans, Limits, Trials

Only two standalone email warm-up tools in this list have a forever-free plan: BobWork Email Warm-up allows up to 20 mailboxes, and TrulyInbox allows 1 email account at 10 warm-up emails/day. If you treat a trial as a free plan, warm-up can stop before deliverability stabilises. This guide separates permanent free access from trials, prices, pools and provider limits.

If you want the broader setup advice first, read the free email warm-up guide or the private pool versus public network explainer. This page stays narrower: what “free” means on vendor pricing pages.

Which email warm up tool free plan exists?

Method: cheapest paid prices were read on 3 October 2026 from vendor pricing pages. Free-plan and trial limits were checked on vendor pages on 4 October 2026. Prices change, so check before you buy.

Forever-free plans appear first because they do not expire. Trial-only, paid-only and unclear offers follow. When a vendor did not state a limit on its pricing page, the table says “not stated on their pricing page”.

Among standalone warm-up tools, only TrulyInbox with 1 account and 10 emails/day, and BobWork Email Warm-up with up to 20 mailboxes and 3–30 emails/day each, offer a free-forever plan. Every other tool here is a trial, paid plan, bundled plan, or unclear warm-up allowance.

What counts as free?

A free-forever plan has no trial deadline. It may still have mailbox limits, daily caps, provider gaps and feature limits. You can use it for ongoing warm-up without upgrading on a specific date.

A trial is different. It can help you test setup, provider support, dashboards and workflow fit. It should not be treated as ongoing warm-up capacity, especially when a new domain often needs 3–4 weeks before campaigns.

A free test is also different. A spam test, deliverability scan or alerting plan can diagnose issues, but it does not create ongoing warm-up conversations for your mailbox.

For any “free” claim, check five things before connecting mail: mailbox count, warm-up emails per mailbox per day, trial deadline, card requirement and provider support. If a vendor does not state one of those on the pricing page, verify it before relying on the plan.

Which free plans fit?

BobWork Email Warm-up

BobWork Email Warm-up is free forever, works with one mailbox on the shared network (2 for a private pool), allows up to 20 mailboxes per account, starts at 3 emails/day per mailbox, ramps to 30/day, and requires no credit card.

Choose BobWork if you want free warm-up with no time limit. By default your mailboxes warm in the shared network; switch the account to Private pool and only your own addresses exchange warm-up mail.

The main limit is Outlook. BobWork does not support Outlook or Microsoft 365 yet because Microsoft requires OAuth for this connection path. Microsoft documents the relevant flow in its identity platform authorization code flow documentation.

Gmail and Google Workspace work through Google sign-in or IMAP with an app password. Google can show an unverified-app notice because BobWork has not done the CASA audit. Google explains this kind of review in its OAuth app verification documentation.

A private pool needs at least two mailboxes, because one mailbox cannot warm itself; in the shared network one is enough. If you have several Gmail, Zoho, Yahoo, iCloud, Lark, SES, SendGrid, Mailgun or generic IMAP+SMTP mailboxes, the free warm-up tool can run either model for them.

TrulyInbox

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

Choose TrulyInbox if you need one free mailbox and Outlook support. Its vendor page lists a peer network with Google, Microsoft and Zoho counts, and it lists Outlook support.

The limit is scale. One free account and 10 warm-up emails/day is a small allowance. If you need several mailboxes warming at the same time, compare the paid Starter plan against other paid tools before choosing.

Which trials are only trials?

Mailivery has no free plan. It offers a trial, but trial limits and card requirement were not stated on its pricing page. The Starter plan is listed at $29/mo. Confirm mailbox count, daily cap and card requirement before connecting production mailboxes.

Warmbox has no free plan. Its listed trial is not a permanent free offer, and the trial length, mailbox limit and daily cap were not stated on its pricing page. The paid Solo plan is listed at $15/mo yearly or $19 monthly.

Instantly has no free plan. Its 14-day trial includes 250 contacts, 1,000 emails, warm-up from day one, no card, and account deletion if you do not upgrade. It fits teams testing outreach and warm-up together, not buyers seeking long-running free warm-up.

Warmup Inbox has no free plan. It offers a 7-day no-card trial with full plan access, while the trial mailbox limit was not stated on its pricing page. Its Basic plan is $15/inbox/mo annually or $19 monthly, with 75 warm-up messages/day.

Smartlead has no free plan. Its 14-day no-card trial includes 2,500 sends, 1,250 contacts, warm-up bundled and unlimited accounts. If your question is “how many free warm-up emails per inbox per day?”, verify that directly.

Lemwarm has no standalone free plan. Vendor pages give conflicting trial information, and free warm-up limits were not stated on the pricing page. Its Essential plan is listed at $24/mo annually or $29 monthly per email account.

Warmy has no free plan. It offers a 7-day no-card trial, while free mailbox limits and daily caps were not stated on its pricing page. Its page says “over 1 million” mailboxes and lists “any ESP”, including Gmail, Outlook, Zoho, SES, Mailgun and SendGrid.

InboxAlly has no free plan. It offers a 10-day no-card trial, while free mailbox limits and daily caps were not stated on its pricing page. The Starter plan is listed at $149/mo with 100 seed emails/day.

Which offers are paid or unclear?

Mails.ai has a free tier, but its pricing page now sells an agent-email API with 1 agent and 3,000 events/month. Warm-up volume was not stated, so it should not be counted as a clear free warm-up allowance from the pricing-page facts available here.

MailReach has no free plan and no trial. Its free offer is a spam test only, limited to 3 tests per 24 hours. The cheapest paid price is $19.50/mailbox/mo, with up to 100 warming emails/day.

Folderly has a free plan for alerts plus 2 tests/month. Warm-up is not free, and the warm-up trial is 7 days for 1 inbox. The warm-up price is listed at $96/mailbox/mo.

What must you check first?

A free plan can start warm-up. It does not repair broken authentication, poor targeting, spammy copy or unrealistic sending volume.

Check SPF, DKIM and DMARC before you send campaigns. You can use the free SPF checker, DKIM checker and DMARC checker before connecting a mailbox.

Use a realistic schedule. A typical starting point is 14 days of warm-up for an existing domain and 3–4 weeks for a new domain. The day-by-day warm-up timeline explains what changes during the first month.

During campaigns, keep warm-up modest. A typical working range is 10–15 warm-up emails/day while real sending runs. Keep real outreach at 30–50/day per mailbox, and add mailboxes instead of forcing one address to send more.

Google’s sender guidance matters if you send to Gmail users. Google says senders should keep spam complaint rates below 0.10% and avoid reaching 0.30% or higher in Postmaster Tools. Check the current wording in Google’s email sender guidelines.

BobWork checks SPF, DKIM and DMARC daily per domain and shows the results inside the tool. The free pool also handles warm-up replies, rescue actions and scheduling automatically, but only for warm-up mail carrying its own hidden header or known Zoho subject. Real mail is never read, moved or answered.

If you are comparing network safety, read what an email warm-up network is. If your messages already land in spam, start with why emails go to spam before blaming the warm-up tool.

Do this now

Use this checklist before you choose a free plan or trial. It prevents the common mistake: signing up for a “free” tool that cannot warm the number of mailboxes you actually need.

Pick BobWork if you have non-Outlook mailboxes and need the largest permanent free mailbox allowance shown in the table. Its limits are real: no Outlook yet, Google may show an unverified-app notice, and you must bring your own mailboxes.

Pick TrulyInbox if you need one free mailbox, a 10 emails/day cap and Outlook support. It is the other clear free-forever warm-up plan in this list.

Pick a trial-only tool if you are close to buying that platform anyway. Trials are good for checking setup, dashboards, provider support and workflow fit. They are not the same as a free warm-up plan.

If your goal is to warm several owned mailboxes without paying, start with BobWork Email Warm-up. It is free, has no credit card and no time limit, supports up to 20 mailboxes per account, and lets each account choose the shared network or its own private pool.

Frequently asked questions