[postfix-es] To block backscatter mail

[Carlos Alberto Bernat Orozco]

Hi group

Thanks for your answers!! Sorry if I don't write you as soon as
possible. I'm watching the logs to see some ID's. This is what I
founfd

>
> You do not mention what happens to the emails after they are queued.
> If you are blacklisted I suppose these emails are delivered to their
> destinations. Try to "grep" your mail log with some mail IDs to see
> what is happening.
>

Jul 27 10:48:05 server postfix/qmgr[4492]: 73050104EEF:
from=<bfo en midominio.net.co>, size=6792, nrcpt=4 (queue active)
Jul 27 10:48:16 server postfix/smtp[27345]: 73050104EEF: host
c.mx.mail.yahoo.com[216.39.53.3] said: 421 4.7.0 [TS01] Messages from
MY-IP-ADD-RESS temporarily
deferred due to user complaints - 4.16.55.2; see
http://postmaster.yahoo.com/421-ts01.html (in reply to end of DATA
command)
Jul 27 11:48:20 server postfix/smtp[27345]: 73050104EEF:
to=<callrbwsjhqitxlo en yahoo.com>,
relay=d.mx.mail.yahoo.com[66.196.82.7], delay=96634, status=deferred
 (host d.mx.mail.yahoo.com[66.196.82.7] said: 451 Message temporarily
deferred - [170] (in reply to end of DATA command))
Jul 27 11:48:20 server postfix/smtp[27345]: 73050104EEF:
to=<callryan en yahoo.com>, relay=d.mx.mail.yahoo.com[66.196.82.7],
delay=96634, status=deferred (host d
.mx.mail.yahoo.com[66.196.82.7] said: 451 Message temporarily deferred
- [170] (in reply to end of DATA command))

As you can see some not existent email accounts are sending a lot of
SPAM to you. I'm listed by yahoo.

> Do you have any web server running on the same box where your Postfix
> is? If yes, it is possible that you have a badly implemented script
> (PHP, CGI or other) which is used to generate spam. Try to check on
> that.
>

Yes I have Apache 2.x. I'm running a webmail in the same server. How
can I check if this is the problem?

Thanks for any help!!