Issue spf: stderr: SKIP

[JamesWhitaker]

Server operating system version

Ubuntu 24.04.4 LTS

Plesk version and microupdate number

18.0.81 #3

Hello,

I'm having some problems with my email configuration.
SPF spam protection is enabled in the settings and set to: "Only create Recieved-SPF headers, never block".
However, such a SPF_header is not added to the emails I recieve.
Some emails mention SPF in the "Authentication-Results", most do not:

Authentication-Results: sub.sender.com;
dkim=none;
dmarc=pass (policy=quarantine) header.from=sender.com;
spf=pass (sub.sender.com: domain of [email protected] designates 000.111.222.333 as permitted sender) smtp.mailfrom=[email protected]

DKIM is also enabled and works perfectly fine.
In the logs I see a lot of mentions of:

spf: stderr: SKIP
check-quota: stderr: SKIP

I think the Plesk mail filter skips the SPF check for some reason.
Any suggestions as to why are much appreciated!


OS: Ubuntu 24.04.4 LTS
Product: Plesk Obsidian 18.0.81 Update #3

 

[Sebahat.hadzhi]

spf: stderr: SKIP and check-quota: stderr: SKIP usually indicate that the messages are from authenticated senders, thus, the SPF checks were skipped. About the Authentication-Results header, could you please provide an example of the full message header?