Trying to understand some email issues

[Patrick Mahan]

Thanks,

mxtoolbox shows that I am on 13 out of 95 blacklists, so it seems I was
sending out spam.

Patrick

On Mon, Jan 21, 2019 at 8:47 AM Kurt Buff - GSEC, GCIH <kurt.buff at gmail.com>
wrote:

> On Sun, Jan 20, 2019 at 10:34 PM Patrick Mahan <plmahan at gmail.com> wrote:
> >
> > 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
>
> I'd suggest, as a first measure, going to https://mxtoolbox.com, and
> looking at their reports for your domain name and your IP address.
>
> Understanding your config and your logs is good, but a quick review of
> how others see your domain can point you in the right direction if
> there's an error in your config.
>
> For instance, you might have inadvertently made your host an open
> relay, and mxtoolbox will understand that. (that just an example - it
> actually seems unlikely, as otherwise you'd be getting bounces from
> more than just yahoo)
>
> Kurt
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