What is a soft opt-in? A Clear Guide

A soft opt-in lets you email existing customers about similar products without fresh consent, under narrow rules in some regions.

Why it matters

Knowing a soft opt-in helps you land 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 a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.