gmail.com problems and this list

Wolfgang S. Rupprecht wolfgang.rupprecht+gnus200707 at gmail.com
Tue Jul 10 08:14:03 CEST 2007


Marco Barreno <barreno at cs.berkeley.edu>
writes:
> Can someone with admin access to the list machine send me the SMTP
> logs for one of the duplicated messages?  I'm working in the Gmail
> group at Google for the summer and I can have someone try to diagnose
> the problem from this end.  The full SMTP logs would be helpful.

I don't have access there, but I can fill in part of the puzzle.  

At least one of the opemoko machines at 88.198.124.203 opens an smtp
connection back to the sending domain to verify the sender address of
any incoming message.  The smtp-back machine has messed up DNS.  The
claimed rDNS for that IP is "openmoko.org" but the forward DNS check
for that "openmoko.org" doesn't list 88.198.124.203 as a valid
address.  If the sending machine is checking for spammers claiming a
bunk DNS name will reject 88.198.124.203's SMTP verify.  The opemmoko
machine will then interpret that failed smtp verify attempt as the
verified address not existing and will decline the initial incoming
transfer.

In short, folks really need to check the forward and backward DNS and
make sure it is consistent, especially if that machine tries open an
outgoing SMTP connection (such as the attempted verification).

Jul  9 12:48:17 arbol postfix/smtp[26802]: 29AF91C98001: to=<xxx at openmoko.com>, relay=sita.openmoko.org[88.198.124.203]:25, delay=6.2, delays=0.18/0.04/5.4/0.64, dsn=4.0.0, status=deferred (host sita.openmoko.org[88.198.124.203] said: 451 Could not complete sender verify callout (in reply to RCPT TO command))
Jul  9 12:55:35 arbol postfix/smtpd[26864]: warning: 88.198.124.203: address not listed for hostname openmoko.org
Jul  9 12:55:35 arbol postfix/smtpd[26864]: connect from unknown[88.198.124.203]
Jul  9 12:55:36 arbol postfix/smtpd[26864]: NOQUEUE: reject: RCPT from unknown[88.198.124.203]: 554 5.7.1 Client host rejected: cannot find your hostname, [88.198.124.203]; from=<> to=<xxx at wsrcc.com> proto=SMTP helo=<sita.openmoko.org>
Jul  9 12:55:36 arbol postfix/smtpd[26864]: disconnect from unknown[88.198.124.203]
Jul  9 12:55:38 arbol postfix/smtp[26863]: 29AF91C98001: to=<xxx at openmoko.com>, relay=sita.openmoko.org[88.198.124.203]:25, delay=447, delays=441/0.05/1.2/4.3, dsn=5.0.0, status=bounced (host sita.openmoko.org[88.198.124.203] said: 550-Verification failed for <xxx at wsrcc.com> 550-Called:   64.142.50.224 550-Sent:     RCPT TO:<xxx at wsrcc.com> 550-Response: 554 5.7.1 Client host rejected: cannot find your hostname, [88.198.124.203] 550 Sender verify failed (in reply to RCPT TO command))

-wolfgang
-- 
Wolfgang S. Rupprecht                http://www.wsrcc.com/wolfgang/
IPv6 on Fedora 7 http://www.wsrcc.com/wolfgang/fedora/ipv6-tunnel.html





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