Hi,

We have set up one (of many) mailing lists using Postfix / LDAP as an alias.

In one case, one of the members of the mailing list, has tried to send a message to the mailing list and it was delivered fine to all other members except to his own mail address:

   <mikebl...@lcc.uma.es> (expanded from <project-...@noa.gr>): host
         correoe1.uma.es[150.214.47.230] said: 554 5.7.1
   <mikebl...@lcc.uma.es>:
   Senderaddress rejected: MX points to Loopback address [RFC1700] (in
   replyto RCPTTO command)

Delivery Report:

   Reporting-MTA: dns; vmail.noa.gr
   X-NOA-Mail-Srv-XAPITI-XPICTOY-Queue-ID: DE9006D6770
   X-NOA-Mail-Srv-XAPITI-XPICTOY-Sender: rfc822; mikebl...@lcc.uma.es
   Arrival-Date: Sun, 17 May 2015 00:47:15 +0300 (EEST)

   Final-Recipient: rfc822; mikebl...@lcc.uma.es
   Original-Recipient: rfc822;project-...@noa.gr
   Action: failed
   Status: 5.7.1
   Remote-MTA: dns; correoe1.uma.es
   Diagnostic-Code: smtp; 554 5.7.1 <mikebl...@lcc.uma.es>: Sender
   address rejected:
        MX points to Loopback address [RFC1700]

This does not seem to have happened in other cases that I know of.

Can you please suggest a reason of this rejection or suggest a way to further investigate?

The error message is not meaningful to me (and an Internet search did not help me).

The full log from the server is:

May 17 00:47:15 vmail postfix/smtpd[4332]: DE9006D6770: client=mailgw3.noa.gr[2001:648:2ffc:126::2] May 17 00:47:15 vmail postfix/cleanup[4370]: DE9006D6770: message-id=<5d7d3d48fa5d44d2e7e49d5d2352f...@lcc.uma.es> May 17 00:47:16 vmail postfix/qmgr[2603]: DE9006D6770: from=<mikebl...@lcc.uma.es>, size=3406, nrcpt=11 (queue active) May 17 00:47:16 vmail postfix/smtpd[4332]: disconnect from mailgw3.noa.gr[2001:648:2ffc:126::2] May 17 00:47:16 vmail postfix/pipe[4371]: DE9006D6770: to=<us...@noa.gr>, orig_to=<project-...@noa.gr>, relay=dovecot, delay=0.81, delays=0.28/0.014/0/0.52, dsn=2.0.0, status=sent (delivered via dovecot service)
... <other list members>...
May 17 00:47:18 vmail postfix/smtp[4484]: DE9006D6770: to=<mikebl...@lcc.uma.es>, orig_to=<project-...@noa.gr>, relay=correoe1.uma.es[150.214.47.230]:25, delay=2.4, delays=0.28/0.024/1.6/0.55, dsn=5.7.1, status=bounced (host correoe1.uma.es[150.214.47.230] said: 554 5.7.1 <mikebl...@lcc.uma.es>: Sender address rejected: MX points to Loopback address [RFC1700] (in reply to RCPT TO command))
... <other list members>...

Although IMHO it should not be of any importance to resolve this case, the alias is set up (in LDAP) as follows:

   dn: cn=project-wp2,ou=Aliases,dc=noa,dc=gr
   objectClass: maillist
   owner: cn=AstroAdmins,ou=Groups,dc=noa,dc=gr
   mailacceptinggeneralid: project-...@noa.gr
   cn: project-wp2
   maildrop: us...@noa.gr
   maildrop: mikebl...@lcc.uma.es
   maildrop: ...

Please advise.

Thanks in advance,
Nick




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