Why Your Emails Go to Spam in Proton Mail (and How to Fix It)

Emails landing in spam in Proton Mail? Each inbox has its own rules. Here is how to fix it.

How to reach the inbox in Proton Mail

Authenticate fully and keep a clean sending reputation; Proton is strict about unauthenticated or spammy mail.

The universal foundation

• SPF, DKIM and DMARC alignment.
• A dedicated, warmed IP.
• Clean, engaged lists.

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.