Sendmail transmission problems

From: <maurerf_at_post.ch>
Date: Fri, 07 May 1999 15:38:41 +0200

Hi all,

Since few days we have problems to deliver mails to some customers, in our
side the mails are staying in the queue:

JAA00893 1098 Fri May 7 09:13 <epineyp_at_post.ch>
                 (<kathleen.treanor_at_ipc.be>... reply: read error from
mailserv)
                                   <kathleen.treanor_at_ipc.be>

JAA25220 2443 Thu May 6 09:46 <mischlere_at_post.ch>
                 (<patricia.metten_at_ping.be>... reply: read error from
pophost.)
                                   <patricia.metten_at_ping.be>

NAA23761* 4241 Tue May 4 13:58 <helpdesk_at_post.ch>
                 (<marie-pierre.degive_at_posteurop.org>... reply: read error
fro)
                                   <marie-pierre.degive_at_posteurop.org>

Mail.log:

May 7 02:02:22 ns1 sendmail[24902]: PAA13142: to=sol_at_belgium.eu.net, ctla
ddr=maurerf (200/15), delay=10:59:11, xdelay=00:10:23, mailer=esmtp, relay
=pophost.eunet.be. [193.74.208.146], stat=Deferred: Connection timed out w
ith pophost.eunet.be.

In one of our customer mail.log:

May 6 06:17:12 dax sendmail[8892]: GAA08892: collect: premature EOM:
Connection reset by ns1.post.ch
May 6 06:17:12 dax sendmail[8892]: GAA08892: SYSERR(mailmast): collect: I/O
error on connection from ns1.
post.ch, from=<helpdesk_at_post.ch>: Resource temporarily unavailable
May 6 06:17:12 dax sendmail[8892]: GAA08892: from=<helpdesk_at_post.ch>,
size=0, class=0, pri=0, nrcpts=1, p
roto=ESMTP, relay=ns1.post.ch [195.65.4.243]

This appear to meat a FAQ (sendmail.org):

Q3.10 -- How do I solve "collect: I/O error on connection" or "reply: read
error from host.name" errors?
Date: April 8, 1997
Updated: June 4, 1998
There is nothing wrong. This is just a diagnosis of a condition that had not
been diagnosed before. If you are getting a lot of these from a single host,
there is probably some incompatibility between 8.x and that host. If you get
a lot of them in general, you may have network problems that are causing
connections to get reset.

Note that this problem is sometimes caused by incompatible values of the MTU
(Maximum Transmission Unit) size on a SLIP or PPP connection. Be sure that
your MTU size is configured to be the same value as what your ISP has
configured for your connection. If you are still having problems, then have
your ISP configure your MTU size for 1500 (the maximum value), and you
configure your MTU size similarly.

Although it seems like a problem of this sort would affect all of your
connections, that is not the case. You may encounter this problem with only
a small number of sites with which you exchange mail, and it may even affect
only certain size messages.


I did try to change my sendmail version from 8.9.3 back to 8.9.1 without
success. Our ISP tells that He can mail to those domains without problems.
Our mails arrives very intermittely. I suppose this is somewhere in the
network, but how can I troubleshoot?

Do you have any suggestions?
__________________________________________________

Felix Maurer
Die Schweizerische Post Tel: +41-31-338 98 49
Informatik POST Fax: +41-31-338 98 80
Messaging Management
Webergutstrasse 12 Mailto:maurerf_at_post.ch
CH-3030 Bern http://www.post.ch
__________________________________________________
Received on Fri May 07 1999 - 13:41:23 NZST

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