What is an autoresponder? A Clear Guide

An autoresponder sends a pre-written email automatically in response to a trigger, such as a signup or purchase.

Why it matters

Knowing an autoresponder 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.