sendmail probs with msgs larger than 100kb

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hi, i'm having some probs with sendmail-8.12.11-4.RHEL3.1 and perhaps
someone on this list could shed some light.

mails larger than 100kb or so are getting stuck at DATA and are
sitting idly in /var/spool/clientmqueue but smaller size emails are
being sent without probs. /var/log/maillog shows a bunch of timeouts
connecting to localhost but the daemon is definitely running on
localhost on port 25. iptables is completely down. i'm not exactly
sure what has changed with the introduction of the smmsp aside from
sendmail running setgid instead of setuid root but i never had any
probs with 8.11 or earlier with the default config. i've compiled 8.13
on this same box and have run into the same prob... ugh. in
desperation i upgraded to the 2.4.21-27.0.2 kernel and the
clientmqueue flushed upon rebooting but now they're starting to choke
again. any help would be sincerely appreciated.

from /var/log/maillog:

Apr 14 00:33:58 testmachine sm-msp-queue[11610]: j3AGmhm2026980:
to=postgres, delay=3+14:35:15, xdelay=00:00:00, mailer=relay,
pri=8149088, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection
timed out with [127.0.0.1]
Apr 14 00:33:58 testmachine sm-msp-queue[11610]: j3ACR729002195:
to=sysadmin@xxxxxxxxxx,murray@xxxxxxxxxx, ctladdr=postgres (503/503),
delay=3+19:06:51, xdelay=0:00:00, mailer=relay, pri=8627790,
relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with
[127.0.0.1]
Apr 14 00:33:58 testmachine sm-msp-queue[11610]: j39Cmfm2025894:
to=postgres, delay=4+18:35:17, xdelay=00:00:00, mailer=relay,
pri=10558309, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection
timed out with [127.0.0.1]
Apr 14 00:33:58 testmachine sm-msp-queue[11610]: j398iVPv002644:
to=sysadmin@xxxxxxxxxx,murray@xxxxxxxxxx, ctladdr=postgres (503/503),
delay=4+22:49:27, xdelay=00:00:00, mailer=relay, pri=10947013,
relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection timed out with
[127.0.0.1]


[root@testmachine root]# sendmail -v -Ac -q

Running /var/spool/clientmqueue/j3DMmnm2027088 (sequence 1 of 10)
j3DMmnm2027088: locked

Running /var/spool/clientmqueue/j3DIYtTH032078 (sequence 2 of 10)
sysadmin@xxxxxxxxxx,murray@xxxxxxxxxxxxx Connecting to [127.0.0.1] via relay...
220 testmachine.domain.com ESMTP Sendmail 8.12.11/8.12.11; Thu, 14 Apr
2005 01:27:18 -0700
>>> EHLO testmachine.domain.com
250-testmachine.domain.com Hello localhost.localdomain [127.0.0.1],
pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH GSSAPI
250-DELIVERBY
250 HELP
>>> MAIL From:<postgres@xxxxxxxxxxxxxxxxxxxxxx> SIZE=186113
AUTH=postgres@xxxxxxxxxxxxxxxxxxxxxx
250 2.1.0 <postgres@xxxxxxxxxxxxxxxxxxxxxx>... Sender ok
>>> RCPT To:<sysadmin@xxxxxxxxxx>
>>> RCPT To:<murray@xxxxxxxxxx>
>>> DATA
250 2.1.5 <sysadmin@xxxxxxxxxx>... Recipient ok
250 2.1.5 <murray@xxxxxxxxxx>... Recipient ok
354 Enter mail, end with "." on a line by itself


[root@testmachine root]# ps -ef | grep sendmail | grep -v grep
root     11600     1  0 00:23 ?        00:00:00 sendmail: accepting connections
smmsp    11609     1  0 00:23 ?        00:00:00 sendmail: Queue
runner@01:00:00 for /var/spool/clientmqueue
root     11612 11600  0 00:23 ?        00:00:00 sendmail:
j3E7Nw29011612 localhost.localdomain [127.0.0.1]: DATA
root     15091 11600  0 01:01 ?        00:00:00 sendmail:
j3E81oBR015091 localhost.localdomain [127.0.0.1]: DATA
root     15095 11600  0 01:02 ?        00:00:00 sendmail:
j3E822si015095 localhost.localdomain [127.0.0.1]: DATA
smmsp    17360 11609  0 01:23 ?        00:00:00 sendmail:
./j3DMmnm2027088 [127.0.0.1]: client DATA 354
root     17361 11600  0 01:23 ?        00:00:00 sendmail:
j3E8Nw08017361 localhost.localdomain [127.0.0.1]: DATA
root     17515 11600  0 01:27 ?        00:00:00 sendmail:
j3E8RInh017515 localhost.localdomain [127.0.0.1]: DATA


[root@testmachine root]# netstat -an | grep 25
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN


[root@testmachine root]# iptables -vnL
Chain INPUT (policy ACCEPT 1791K packets, 395M bytes)
pkts bytes target     prot opt in     out     source               destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination
Chain OUTPUT (policy ACCEPT 1858K packets, 435M bytes)
pkts bytes target     prot opt in     out     source               destination


[root@testmachine mail]# egrep -v "^#" /etc/mail/access
localhost.localdomain           RELAY
localhost                       RELAY
127.0.0.1                       RELAY


[root@testmachine mail]# grep -i "max.*message.*size" /etc/mail/sendmail.cf
# maximum message size
#O MaxMessageSize=1000000


[root@testmachine mail]# grep -i "max.*message.*size" /etc/mail/submit.cf
# maximum message size
#O MaxMessageSize=1000000


[root@testmachine etc]# egrep "local|testmachine" /etc/hosts
127.0.0.1       localhost.localdomain              localhost
10.0.2.232     testmachine.domain.com         testmachine


[root@testmachine etc]# egrep hosts /etc/nsswitch.conf
hosts:      files dns

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