Dmarc

Links

• DMARC overview
• Mailman and DMARC
• Dmarc and Postfix

The dmarc record

v

Protocol version

p

Policy

p=quarantine indicates that email servers should "quarantine" emails that fail DKIM and SPF — considering them to be potentially spam. Other possible settings for this include p=none, which allows emails that fail to still go through, and p=reject, which instructs email servers to block emails that fail

sp

Policy for subdomains

adkim

Alignment mode for DKIM: adkim

s

Strict

r

Relaxed

aspf

Alignment mode for SPF

s

Strict

r

Relaxed

rua

Reporting URI of aggregate reports

ruf

Reporting URI for forensic reports

pct

Percentage of messages subjected to filtering

HOWTO

Understanding dmarc report

• How to read a DMARC report—and actually understand it!

Look up dmarc record

dig _dmarc.example.com TXT

Tools

• rrdmarc
• dmarcts

Open-Report-Parser

innodb_large_prefix is deprecated