Trying to understand some email issues

[Carmel NY]

On Sun, 20 Jan 2019 22:33:02 -0800, Patrick Mahan stated:

>All,
>
>FreeBSD 11.2
>
>Running postfix 3.3.2_1,1
>
>I'm getting hammered with thousands of emails from yahoo.com -
>
>Here is an example -
>
>Jan 20 22:09:01 ns postfix/smtp[1308]: 2DA97A2E2EF:
>to=<pwascak at aol.com>,
>relay=mx-aol.mail.gm0.yahoodns.net[98.137.157.43]:25, delay=13730,
>delays=13728/0.31/1.1/0.06, dsn=4.7.0, status=deferred (host
>mx-aol.mail.gm0.yahoodns.net[98.137.157.43] said: 421 4.7.0 [TSS04]
>Messages from 23.24.207.145 temporarily deferred due to user
>complaints - 4.16.55.1; see
>https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL
>FROM command))
>
>I'm trying to determine if I am somehow relaying emails to yahoo.com,
>or is this someone attacking me.
>
>I am pretty sure I have postfix to avoid acting like a relay for
>unauthenticated connections.  But this maybe something I have messed
>up. This has been happening only since I upgraded to 11.2 (I was at
>9.x).  I also just recently switch from sendmail to postfix as well.
>
>I can provide my postfix config on request if needed.
>
>Pointers to other mail-lists are welcomed.  I decided to start here
>before jumping on the postfix mailing list.
>
>Thanks in advance,
>
>Patrick

Patrick, you wouldn't see a podiatrist if you were suffering from
cancer, you would see an oncologist. The same rational is true here.
Your problem deals with "postfix", so your questions should be directed
there. There are an extremely knowledgeable group. The author, Wietse
Venema, quite often chimes in with answers to user's questions. To join
the list, check this out: http://www.postfix.com/lists.html

In any case, see these  URL's for further info:
http://www.postfix.com/DEBUG_README.html
http://www.postfix.com/DEBUG_README.html#mail
Better, provide output from the postfinger tool. This can be found at
http://ftp.wl0.org/SOURCES/postfinger.

-- 
Carmel