Dmarc: Difference between revisions
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*[https://wiki.list.org/DEV/DMARC Mailman and DMARC] | *[https://wiki.list.org/DEV/DMARC Mailman and DMARC] | ||
*[https://www.skelleton.net/2015/03/21/how-to-eliminate-spam-and-protect-your-name-with-dmarc/ Dmarc and Postfix] | *[https://www.skelleton.net/2015/03/21/how-to-eliminate-spam-and-protect-your-name-with-dmarc/ Dmarc and Postfix] | ||
*[https://www.valimail.com/blog/what-is-dmarc-alignment/ What is dmarc alignment?] | |||
=The dmarc record= | |||
*[https://mxtoolbox.com/dmarc/details/what-is-a-dmarc-record what is a dmarc record] | |||
==v== | ==v== | ||
Protocol version | Protocol version | ||
| Line 11: | Line 13: | ||
Policy | Policy | ||
p=quarantine indicates that email servers should "quarantine" emails that fail DKIM and SPF — considering them to be potentially spam. | ; p=quarantine : indicates that email servers should "quarantine" emails that fail DKIM and SPF — considering them to be potentially spam. | ||
; p=none : allows emails that fail to still go through | |||
; p=reject : which instructs email servers to block emails that fail | |||
==sp== | ==sp== | ||
| Line 17: | Line 21: | ||
==adkim== | ==adkim== | ||
Alignment mode for DKIM | Alignment mode for DKIM: [https://mxtoolbox.com/dmarc/details/dmarc-tags/adkim adkim] | ||
===s=== | ===s=== | ||
Strict | Strict | ||
===r=== | ===r=== | ||
Relaxed | Relaxed (default) | ||
==aspf== | ==aspf== | ||
Alignment mode for SPF | Alignment mode for SPF [https://mxtoolbox.com/dmarc/details/dmarc-tags/aspf aspf] | ||
===s=== | ===s=== | ||
Strict | Strict | ||
===r=== | ===r=== | ||
Relaxed | Relaxed (default) | ||
| Line 42: | Line 42: | ||
==pct== | ==pct== | ||
Percentage of messages subjected to filtering | Percentage of messages subjected to filtering | ||
=HOWTO= | =HOWTO= | ||
Latest revision as of 13:24, 3 February 2026
Links
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.
- p=none
- allows emails that fail to still go through
- 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 (default)
aspf
Alignment mode for SPF aspf
s
Strict
r
Relaxed (default)
rua
Reporting URI of aggregate reports
ruf
Reporting URI for forensic reports
pct
Percentage of messages subjected to filtering
HOWTO
Understanding dmarc report
SPF Alignment
Look up dmarc record
dig _dmarc.example.com TXT
Tools
innodb_large_prefix is deprecated
