MailToaster vs Warmbox (2026): which should you pick?

Pick MailToaster if

• Fits if you have a few mailboxes that need warming up
• Works alongside a sequencer you already pay for

Look elsewhere if

• Pricey if you run many mailboxes, because the fee is charged on every connected account
• Not for you if you want sequencing or leads, as it only warms up
• Watch out: the pricing page says a 7-day trial and the home page 14 days
• Skip it if you want a clear commitment, since the yearly rate carries a minimum commitment the page does not spell out

Pick Warmbox if

• Fits if you send cold email from one or two new mailboxes and want a warm-up run in the background
• Works for agencies that connect many client inboxes and will ask for a custom plan

Look elsewhere if

• Skip it if you want a free try, because there is no trial or free plan
• Tight if you run more than 6 inboxes, as plans stop there and larger setups are custom
• Pricey if you add inboxes: $15 for 1 inbox becomes $69 for 3
• Watch out: the vendor says warm-up usually needs 15 to 30 days of uninterrupted running before results show
• Watch out: the pricing page doesn't say which billing period each of its two price sets applies to

MailToaster

• Pricing is per connected email account, so cost grows with every mailbox.
• The pricing page and homepage state different trial lengths, 7 and 14 days.
• The yearly rate is 10% below monthly, with a minimum commitment the page does not spell out.
• It only warms up mailboxes; there is no sequencing or lead tool.

Warmbox

• The pricing page does not state which billing period each of its two price sets applies to; the default view shows $15 for Solo and the other toggle shows $19.
• Plans are sized by the number of inboxes (1, 3 or 6) and by emails a day, so larger setups need a custom plan.
• The vendor says warm-up usually takes 15 to 30 days of uninterrupted warming before results show.
• It warms mailboxes only; it does not send campaigns or find leads.

MailToaster

Peer-to-peer warm-up

Warm-up emails are exchanged only with a network of real inboxes, with no free or temporary accounts, according to the vendor.

Realistic engagement

The system opens and replies to messages, marks them important and moves them out of spam to build reputation.

Two warm-up profiles

New Email Account builds reputation from scratch; Reputation Protect maintains deliverability on accounts already in use.

DNS checks

Checks the validity of SPF, DKIM, DMARC and related DNS records for a connected account.

Generated or custom text

Warm-up emails can use text generated by a GPT-3 assistant or your own templates, filtered into a separate inbox folder.

Progress reports

Detailed reports track warm-up progress for each connected account.

Warmbox

Automated warm-up traffic

Sends and answers messages with a private inbox network, marks them as favorites and removes them from spam.

Warm-up profiles

Growth, flat or random volume patterns, a warm-up schedule and fully custom settings.

Realistic content

The page says replies are written to look human, using GPT-4 and a hybrid approach.

Checks and monitoring

A live email checker for DNS and blacklists, spam score monitoring and a reporting dashboard.

Many inbox types

Gmail and Google Workspace by OAuth, Microsoft 365, Yahoo, iCloud, AOL, Zoho, SendGrid, Mailgun, Amazon SES and any SMTP mailbox.

Agency use

Multi-account support for agencies and team members on every plan.

MailToaster

• Email Warm-up, Yearly$26

  per email account / month, billed yearly

  Flat fee per connected account with multiple warm-up profiles. The pricing page notes a minimum commitment applies.

• Email Warm-up, Monthly$29

  per email account / month, billed monthly

  Same warm-up features billed monthly; cancel or resume any time.

Warmbox

• Solo$15

  per month for 1 inbox, billing basis unclear

  1 inbox warmed at up to 50 emails a day, 1 member and premium support. The page's other toggle lists $19.

• Start-up$69

  per month for 3 inboxes, billing basis unclear

  3 inboxes at up to 250 emails a day, 3 team members and premium support. The other toggle lists $79.

• Growth$139

  per month for 6 inboxes, billing basis unclear

  6 inboxes at up to 500 emails a day, 6 team members and enterprise support. The other toggle lists $159.

• TeamCustom

  Custom plans for larger sending volumes, quoted through the vendor's chat.

MailToaster

• Annual discount

  10% off with yearly billing

  The pricing page toggle shows yearly billing at $26 per email account a month against $29 billed monthly, labeled a 10% discount.

Warmbox

No public discounts listed.