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

Pick Mailivery if

• Fits if you already send cold email and need your mailboxes warmed
• Works for small teams with a handful of mailboxes

Look elsewhere if

• Skip it if you want a tool that sends campaigns, since it only warms up
• Tight if you have many users: seats stop at 2, 4 and 10 across the plans
• Watch out: the yearly Professional card says 600 emails a day, the table says 800
• Pricey if you want more verification credits, which are one-time purchases

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

Mailivery

• Each mailbox is limited to 100 warm-up emails a day on Starter and 250 on Professional and Business.
• Email verification credits are one-time; extra credits are bought inside the platform.
• The yearly Professional card says 600 emails a day while the monthly card and comparison table say 800.
• User seats are capped at 2, 4 and 10 on the three plans.

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.

Mailivery

Shared warm-up volume

Connect as many mailboxes as you like; the plan caps total warm-up emails a day, which you split across them.

Peer-to-peer warm-up

Warm-up emails go between customers' inboxes, with AI-generated text, rescue from spam or Promotions and positive replies.

Adjustable reply rate

Set the daily volume, schedule and reply rate, up to 30% on Starter and 55% on Professional and Business.

Deliverability bundle

Blacklist monitoring, one-time email verification credits, inbox placement tests and a spam words checker come with each plan.

Mailbox connections

Connects to Gmail, Google Workspace and Microsoft 365, or any mailbox over SMTP.

REST API

Connect mailboxes, start or pause warm-up, change volume and pull health scores, with webhook notifications.

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.

Mailivery

• Starter$21.75

  per month, billed yearly ($29 billed monthly)

  200 warm-up emails a day shared across mailboxes, 2 users, 2 blacklist monitors and 100 verification credits.

• Professional$59.25

  per month, billed yearly ($79 billed monthly)

  800 warm-up emails a day, 4 users, 10 blacklist monitors, 500 verification credits and 30 placement tests.

• Business$149.25

  per month, billed yearly ($199 billed monthly)

  2,500 warm-up emails a day, 10 users, 50 blacklist monitors, 2,000 verification credits, 100 placement tests.

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.

Mailivery

• Annual discount

  Yearly billing saves 25%

  Mailivery's pricing page marks yearly billing as 25% off, for example Starter at $21.75 a month against $29 monthly.

Warmbox

No public discounts listed.