From: Hamilton Vera (hamilton.listasgmail.com)
Date: Wed Nov 14 2007 - 04:53:05 CST

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Does your relay server checks if the user exists before relaying?

Relay configuration is very simple, maybe if you post your main.cf
file we can help
in a more accurate way.

[]´s

On 11/14/07, Rocco Scappatura <Rocco.Scappaturasttspa.it> wrote:
> Hello,
>
> I manage an SMTP relay server that receives email for a domain
> 'domain.it' an try to deliver it to a mail server that receives email
> for 'domain.it'.
>
> My local domain is 'av3.mydomain.it'.
>
> I can't figure out why a lot of message from postmaster toward users of
> my email domain that I'm responsible to, are sent (or apparently are
> sent).
>
> For example:
>
> # cat /var/log/mail | grep postmaster
> .
> .
> .
> Nov 14 10:53:18 av3 postfix/qmgr[23784]: 37A0A75022E:
> from=<postmasterav3.mydomain.it>, size=257, nrcpt=1 (queue active)
>
> av3:~ # cat /var/log/mail | grep 37A0A75022E
> Nov 14 10:53:18 av3 postfix/cleanup[21989]: 37A0A75022E:
> message-id=<20071114095318.37A0A75022Eav3.mydomain.it>
> Nov 14 10:53:18 av3 postfix/qmgr[23784]: 37A0A75022E:
> from=<postmasterav3.mydomain.it>, size=257, nrcpt=1 (queue active)
> Nov 14 10:53:18 av3 postfix/smtp[20128]: 37A0A75022E:
> to=<tra.scherlindomain.it>, relay=10.30.32.7[10.30.32.7]:25,
> delay=0.17, delays=0.07/0/0.07/0.03, dsn=5.0.0, status=undeliverable
> (host 10.30.32.7[10.30.32.7] said: 550 tra.scherlindomain.it... No such
> user (in reply to RCPT TO command))
> Nov 14 10:53:18 av3 postfix/qmgr[23784]: 37A0A75022E: removed
>
> Nov 14 10:53:18 av3 postfix/smtpd[19838]: NOQUEUE: reject: RCPT from
> as-0-21.lns2-4c.kharkov.ukrtel.net[82.207.32.21]: 450 4.1.1
> <tra.scherlindomain.it>: Recipient address rejected: undeliverable
> address: host 10.30.32.7[10.30.32.7] said: 550 tra.scherlindomain.it...
> No such user (in reply to RCPT TO command); from=<jquiredcr.net>
> to=<tra.scherlindomain.it> proto=SMTP helo=<goliat.espol.edu.ec>
> Nov 14 10:53:18 av3 postfix/smtp[20128]: 37A0A75022E:
> to=<tra.scherlindomain.it>, relay=10.30.32.7[10.30.32.7]:25,
> delay=0.17, delays=0.07/0/0.07/0.03, dsn=5.0.0, status=undeliverable
> (host 10.30.32.7[10.30.32.7] said: 550 tra.scherlindomain.it... No such
> user (in reply to RCPT TO command))
>
> And so..:
>
> av3:~ # cat /var/log/mail | grep 37A0A75022E
> Nov 14 10:53:18 av3 postfix/cleanup[21989]: 37A0A75022E:
> message-id=<20071114095318.37A0A75022Eav3.mydomain.it>
> Nov 14 10:53:18 av3 postfix/qmgr[23784]: 37A0A75022E:
> from=<postmasterav3.mydomain.it>, size=257, nrcpt=1 (queue active)
> Nov 14 10:53:18 av3 postfix/smtp[20128]: 37A0A75022E:
> to=<tra.scherlindomain.it>, relay=10.30.32.7[10.30.32.7]:25,
> delay=0.17, delays=0.07/0/0.07/0.03, dsn=5.0.0, status=undeliverable
> (host 10.30.32.7[10.30.32.7] said: 550 tra.scherlindomain.it... No such
> user (in reply to RCPT TO command))
> Nov 14 10:53:18 av3 postfix/qmgr[23784]: 37A0A75022E: removed
>
> That is, It seems to me that I (postmaster) try to send a DNS (I
> suppose) to inxistent email address 'tra.scherlindomain.it' to say
> that some one has tried to send it an email, but that message has been
> nevere delivered, because it do not exists (a clearly paradoxical
> situation).
>
> Moreover, postmaster is not notified that in truth someone has tried to
> sent an email to an inexistent email address of a domain which he is
> responsible!!
>
> Where is the trick? Do I miss some logical step or is there any mistake?
>
> Thanks,
>
> rocsca
>

--
Hamilton Vera
int Administrator (char Network[],char ComputationalSystems[]);
Seven Internet http://lib.seven.com.br
"Google is my shepherd, no want shall I know"

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]