What is A/B testing in email? A Clear Guide

A/B testing sends variants of a subject, content or send time to segments to learn what performs best before a full send.

Why it matters

Knowing A/B testing in email helps you send mail that lands in the inbox. See the deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI watching list health and deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.