Mail DNS Setup

Since I always struggle with DNS records for mailservers... here are some examples:

DMARC

_dmarc TXT "v=DMARC1; p=none; rua=mailto:dmarc@domain.tld"

• v - version of DMARC (DMARC1)
• p - policy (none, quarantine, reject)
• rua - URI for agreggate reports (comma-separated)
• ruf - URI for failure reports (comma-separated)

SPF

@ TXT "v=spf1 mx -all"

• v - version (spf1)
• mx - allow emails from servers specified in MX records
• -all - don't allow from everyone else