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A/B testing

Test two subject lines on part of your audience and send the one that performs better to everyone else. Available on Business and above.

Last updated: 2026-10-13

How it works

MailHoor sends version A and version B of the subject line to a share of your recipients. When the test ends, the subject with the better result goes to the rest of the list automatically.

Set up a test

  1. Open Email → Campaigns and create a campaign.
  2. Tick A/B test the subject line and write the second subject.
  3. Choose the test settings shown on screen.
  4. Finish the campaign, pass the pre-send check and send.

Ideas to test

  • A question against a statement.
  • Short against long.
  • Arabic against English.
  • With the offer in numbers ("20% off") against without.

A/B tests start sending right away; they cannot be scheduled.

Change one thing at a time so you know what made the difference. Small lists give noisy results, so test on a few thousand contacts when you can.

  • Re-send automatically to people who don't open: sends the campaign again later, only to people who did not open it.
  • Smart send time (Professional): delivers to each subscriber at their best hour.
Still need help? Email support@mailhoor.com or call +20 101 072 9258. We answer in Arabic and English.