[Mailman-Users] sendmail error: collect: premature EOM: unexpected close

[Thomas Stocker]

Hello List

I know this is a sendmail problem, but maybe one of you 
has experience with this case.

I've set up mailman on a Solaris 9 SPARC box. All runs 
fine, exept one mail (which contains no special chars like 
| (pipes) nor is the subject too long) coming from a java 
app is discarded by sendmail and thus not arriving 
mailman. I've searched the whole day, but found nothing. 
I've also patched sendmail to:

220 bahamas.sila.local ESMTP Sendmail 8.13.8+Sun/8.13.8; 
Wed, 15 Nov 2006 17:14:36 +0100 (CET)

/var/log/syslog states

Nov 15 14:25:47 bahamas sendmail[2873]: [ID 801593 
mail.warning] kAFDElPY002873: collect: premature EOM: 
unexpected close
Nov 15 14:25:47 bahamas sendmail[2873]: [ID 801593 
mail.notice] kAFDElPY002873: collect: unexpected close on 
connection from swexch01lpro.sila.local, 
sender=<CheckTpsAckCnfMailTask at sila.local>
Nov 15 14:25:47 bahamas sendmail[2873]: [ID 801593 
mail.info] kAFDElPY002873: 
from=<CheckTpsAckCnfMailTask at sila.local>, size=1219, 
class=0, nrcpts=1, proto=ESMTP, daemon=MTA-v4, 
relay=swexch01lpro.sila.local [172.25.2.76]

/var/adm/messages says

Nov 10 14:19:28 bahamas sendmail[17781]: [ID 801593 
mail.crit] kAADCavb017781: SYSERR(root): collect: I/O 
error on connection from swexch02rpro.sila.local, 
from=<CheckTpsAckCnfMailTask at sila.local>

The network ist stable. MTUs are set correctly. Sending 
Server is an MS Exchange. All other mails from this (and
others) server are accepted.

exchange banner:

220 SWEXCH.sila.local Microsoft ESMTP MAIL Service, 
Version: 6.0.3790.1830 ready at  Wed, 15 Nov 2006 17:18:58 
+0100

I have no clue for what to look, any ideas would be 
greatly appreciated, with an older Sendmail 
8.12.10+Sun/8.12.2 we did not have seen this problem.

TIA

Tom Stocker