What is separate transactional and marketing streams? A Clear Guide

Keeping transactional and marketing mail on separate streams/subdomains protects your critical mail from marketing reputation issues.

Why it matters

Knowing separate transactional and marketing streams helps you build reliable sending. See the email API quickstart.

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, 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.