[Workaround.org] Check existing user

Fabrizio Regalli fabreg at gmail.com
Sat May 24 14:46:43 CEST 2008


Hi list.
I have a strange problem when a spammer try to send e-mail to a
non-exist user: sometime it's rejected immediately, with message: user
does not exist but sometime is processed by postgrey as you can see in
my log

May 22 08:12:56 server postgrey: action=greylist, reason=new,
client_name=unknown, client_address=77.110.114.151,
sender=pierrette212_49 at bestselected.com, recipient=nospam at fabreg.it
May 22 08:12:56 server postfix/smtpd[25072]: NOQUEUE: reject: RCPT
from unknown[77.110.114.151]: 450 4.2.0 <nospam at fabreg.it>: Recipient
address rejected: Check for spam messages...;
from=<pierrette212_49 at bestselected.com> to=<nospam at fabreg.it>
proto=ESMTP helo=<77-110-114-151.zajoulnet.com>
May 22 08:12:57 server postfix/smtpd[25072]: disconnect from
unknown[77.110.114.151]
May 22 08:13:17 server postfix/smtpd[25072]: connect from
unknown[77.110.114.151]
May 22 08:13:21 server postgrey: action=greylist, reason=new,
client_name=unknown, client_address=77.110.114.151,
sender=editor at teflbus.com, recipient=nospam at fabreg.it
May 22 08:13:21 server postfix/smtpd[25072]: NOQUEUE: reject: RCPT
from unknown[77.110.114.151]: 450 4.2.0 <nospam at fabreg.it>: Recipient
address rejected: Check for spam messages...;
from=<editor at teflbus.com> to=<nospam at fabreg.it> proto=ESMTP
helo=<77-110-114-151.zajoulnet.com>
May 22 08:13:21 server postfix/smtpd[25072]: disconnect from
unknown[77.110.114.151]
May 22 08:13:38 server postfix/smtpd[25072]: connect from
unknown[77.110.114.151]
May 22 08:13:41 server postgrey: action=greylist, reason=new,
client_name=unknown, client_address=77.110.114.151,
sender=khicks at fooksy.net, recipient=nospam at fabreg.it
May 22 08:13:41 server postfix/smtpd[25072]: NOQUEUE: reject: RCPT
from unknown[77.110.114.151]: 450 4.2.0 <nospam at fabreg.it>: Recipient
address rejected: Check for spam messages...; from=<khicks at fooksy.net>
to=<nospam at fabreg.it> proto=ESMTP helo=<77-110-114-151.zajoulnet.com>
May 22 08:13:41 server postfix/smtpd[25072]: disconnect from
unknown[77.110.114.151]

But the user "nospam" doesn't exist.

Could someone please explain me why this happends?

Many thanks.
Fab


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