Trying to understand some email issues

[Odhiambo Washington]

On Mon, 21 Jan 2019 at 11:12, Patrick Mahan <plmahan at gmail.com> wrote:

> Thanks, for the feedback.
>
> I have been reading the postfix documentation, though I agree I don't have
> a good hand on understand its logs.
>
> I am fairly certain, no local users are sending to these accounts.  Which
> is why I am confused about these emails from the yahoo mail server.
>
> But thanks for the steer.
>
> Patrick
>
>>
You cannot be "fairly certain" when it comes to log files. It is
unacceptable!
Start with "grep pwascak at aol.com /var/log/maillog".
There are two entries related to that address.
One entry has the sending IP and the sender address.
The other entry has your server IP sending it to the destination server.
Do the same for the many others!

Please note that you could set your server to be secure, to only relay for
the authenticated, but those authenticated
users could be using weak passwords (dictionary words) and those can be
cracked. Once spammers figure out one
such weak password, they will use it to relay through your server.



-- 
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft.", grep ^[^#] :-)