What is MIME? A Clear Guide

MIME is the standard that lets email carry rich content, attachments and multiple parts (plain text + HTML) in one message.

Why it matters

Knowing MIME 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.