InboxAlly vs Mail-Tester (2026): which should you pick?

Pick InboxAlly if

• Fits if your domain already lands in spam and you send from an email platform, not a mailbox
• Works for senders who won't hand over mailbox or DNS access

Look elsewhere if

• Pricey if you just want one new inbox warmed, at $149 a month billed monthly only
• Tight if you hoped the 10-day trial would show results, as repairs take 4 to 8 weeks
• Skip it if you need list cleaning or DMARC records managed, which it doesn't do
• Watch out: phone support, setup sessions and strategy reviews wait for Premium at $1,190 a month
• Watch out: plans are sized at about 5 seeds per 100 emails sent, so a bigger sender jumps to $645 a month for Plus

Pick Mail-Tester if

• Fits if you want to check one newsletter or template before sending
• Works for developers who want the score inside their own tool

Look elsewhere if

• Tight if you test more than 3 times a day on free, with results kept for 7 days
• Skip it if you want ongoing monitoring, since it tests one message at a time
• Watch out: the score comes from SpamAssassin and other spam filters differ
• Watch out: prices exclude VAT

InboxAlly

• The cheapest plan is $149 a month, well above per-inbox warm-up tools, and the page lists monthly billing only.
• Plans are sized by seed emails a day; the vendor suggests about 5 seeds per 100 emails sent to the domain being repaired.
• Phone support, setup sessions and strategy reviews start on the $1,190 Premium plan.
• The vendor says repair usually takes 4 to 8 weeks, longer than the 10-day trial.

Mail-Tester

• Scores come from a stock SpamAssassin setup; the FAQ says other spam filters differ, so a perfect score does not guarantee inbox placement.
• The free version allows 3 tests in 24 hours and keeps results for 7 days; an account with your own prefix keeps them 30 days.
• Prices exclude VAT.
• It tests one message at a time and does not monitor sending over time.

InboxAlly

Seed network engagement

Seed inboxes across Gmail, Yahoo, Outlook and others open your emails, rescue them from spam, move them out of Promotions and mark them important.

Autowarmup

A hands-off mode in which AI writes the warm-up emails, picks the sending pace and adjusts it as the domain's signals change.

IA Score and IA Reputation

A model predicts inbox placement, and a separate rating marks each domain's reputation as low, medium or high on a live dashboard.

Placement tests and monitoring

Inbox placement tests by provider, live blocklist monitoring and DMARC reporting are included on every plan.

No account access needed

InboxAlly never logs in to your mailbox, sending platform or DNS; you only add its seed addresses to your sends.

API and CRM connections

A REST API on every plan, plus HubSpot and Klaviyo connections that sync the seed contacts into your account.

Mail-Tester

Spam score

Scores a sent message out of 10 using a default SpamAssassin install, with the sign reversed so that a higher score is better.

Configuration report

Reviews the message, the mail server and the sending IP, and lists what is set up correctly and what is not.

JSON API and iframe

Paid plans let you embed mail-tester results in your own software.

White-labeling and custom CSS

Accounts can restyle the result page and fully white-label it, after contacting the company to authorize their domain.

Usage statistics and history

Daily, weekly and monthly usage statistics and a list of the last 30 days of tests, with no ads on results.

InboxAlly

• Starter$149

  per month for 100 seed emails a day, billed monthly

  1 sender profile, email and live chat support and a dedicated customer success manager.

• Plus$645

  per month for 500 seed emails a day, billed monthly

  5 sender profiles, with the same features as Starter.

• Premium$1,190

  per month for 1,000 seed emails a day, billed monthly

  10 sender profiles, phone and Zoom support, a 1-hour setup session and weekly 30-minute strategy reviews.

• EnterpriseCustom

  Thousands of seed emails a day, unlimited sender profiles and dedicated deliverability experts.

Mail-Tester

• Free web interface$0

  3 tests in any 24 hours, no account needed, results available for 7 days.

• 10 Tests$5

  one-time

  A pack of 10 extra tests at $0.50 each. Larger one-time packs run up to 15,000 tests for $700.

• 50 Tests / Month$10

  per month for 50 tests

  Subscription with an account; $0.20 per test.

• 500 Tests / Month$25

  per month for 500 tests

  $0.05 per test.

• 2,000 Tests / Month$80

  per month for 2,000 tests

  Marked most popular on the page; $0.04 per test.

• 7,500 Tests / Month$250

  per month for 7,500 tests

  $0.0333 per test. A 25,000-plus tier is quoted on request.