Issue Spoofed email addresses

[Robert S Tucker]

My mailboxes get emails from spoofed mail accounts which pass SPF an DMARC checks. e.g. mails from admin@mydomain.com even through this email address doesnt exist. How can I stop this?

 

[Kaspar]

What's do the Authentication-Results show in the mail header of such an email?

 

[Akrolis]

This problem is happening a lot lately,

I don't know if there's anything that the Plesk team could do about it to avoid it, but it would be very helpful, because the spoofers/spammers are getting pretty slick in passing SPF, DKIM & DMARC checks

In the meantime, check the headers for this emails. With that info you could:
-Block the actual IP from the actual sender.
-Block the actual domain from the actual sender.
-Write custom spamassassin rule(s) so that the spoof emails get labeled as SPAM.

In my experience, unfortunately there's not a definitive answer to block all spoof emails once and for all, a rule/block that works this week might get bypassed next week.

 

[danami]

I suggest that you guys take a look at the SpamAssassin FromNameSpoof plugin. It should be simple to add it to your SpamAssassin setup:

https://spamassassin.apache.org/full/3.4.x/doc/Mail_SpamAssassin_Plugin_FromNameSpoof.txt

In our Warden product we include it by default.