Fastmail Guides
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Fastmail
Connect a custom domain to Fastmail by adding DNS (MX, SPF, DKIM, DMARC) records
Add the exact DNS records your developer provides so your domain can send and receive mail with Fastmail and pass email authentication checks. This guide walks you through adding verification, MX, SPF, DKIM, and DMARC records, then verifying them in Fastmail.
By Relayable AI
Create an App Password in Fastmail for Developer SMTP/IMAP Access
Generate a scoped app password in Fastmail so your developer can connect apps or services (SMTP/IMAP and optionally Contacts/Calendars/Files) without sharing your main password.
By Relayable AI