Spoofing Emails to My Own Domain

Dear Experts,

I am facing a problem that someone is spoofing my domain address and sending
emails to my own domain users.

I have set valid SPF, DKIM, DMARC for my Mail server. How can I sort this
problem with postfix to stop this spoofing ?

If I filter emails based on SPF this also block many legitimate email with
spf not set properly.

Bilal Ahmad

Network Administrator


Re: Spoofing Emails to My Own Domain

By Dominic Raferd at 07/09/2019 - 12:37

On Tue, 9 Jul 2019 at 17:26, <bilal. ... at kfueit dot> wrote:
If you use opendkim/opendmarc as milters to postfix then opendmarc
should block emails that spoof your domain (as I see you already have
dmarc setting p=reject). If this is not happening then probably you
have some incorrect settings in opendkim.conf or opendmarc.conf. For
instance, in opendmarc.conf you need 'RejectFailures true'.