Often times my sendmail MTA can't deliver large emails (15+ megs) to a receiving MTA. Here's an example of what the log says when the attempt fails:
Aug 11 14:45:18 mail sm-mta[31009]: q76M18iZ014587: to=, delay=4+23:44:10, xdelay=00:21:57, mailer=esmtp, pri=28052803, relay=unitedfresh.org.1.0001.arsmtp.com. [204.232.236.144], dsn=4.0.0, stat=Deferred: 451 Remote connection lost - psmtp
I have speculated this to be a bug, a configuration issue, a network issue, or perhaps the remote MTA simply doesn't want to accept emails larger than a given size. I would like help establishing what exactly the cause is. If the problem is the remote host then I don't care but if the problem is local I need to see if I can fix it. Unfortunately I don't know how to establish which it is.
Are there particular configuration details I should be looking for in sendmail.mc? Do I need to use wireshark on the connection to figure out what is going on when the remote connection is lost? Can anyone recommend a troubleshooting strategy to narrow this down?
Version 8.13.6
Compiled with: DNSMAP LOG MAP_REGEX MATCHGECOS MILTER MIME7TO8 MIME8TO7
NAMED_BIND NETINET NETUNIX NEWDB PIPELINING SASLv2 SCANF USERDB
XDEBUG
divert(-1)
#
# Copyright (c) 1998, 1999 Sendmail, Inc. and its suppliers.
# All rights reserved.
# Copyright (c) 1983 Eric P. Allman. All rights reserved.
# Copyright (c) 1988, 1993
# The Regents of the University of California. All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
include(`/usr/share/sendmail-cf/cf/m4/cf.m4')dnl
VERSIONID(`$Id: mailserver.mc 1.0 11/09/03 $')dnl
OSTYPE(linux)dnl
DOMAIN(generic)dnl
dnl define(`confRUN_AS_USER', `sendmail:sendmail')dnl
undefine(`UUCP_RELAY')dnl
undefine(`BITNET_RELAY')dnl
DAEMON_OPTIONS(`Port=smtp, Name=MTA')
DAEMON_OPTIONS(`Port=26, Name=MTA2')
define(`confTO_CONNECT', `1m')dnl
define(`confTRY_NULL_MX_LIST',true)dnl
define(`confDONT_PROBE_INTERFACES',true)dnl
define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl
define(`ALIAS_FILE', `/etc/aliases')dnl
define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
define(`confAUTH_OPTIONS', `A')dnl
define(`confMAX_MESSAGE_SIZE', `50000000')dnl
TRUST_AUTH_MECH(`LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `LOGIN PLAIN')dnl
FEATURE(`no_default_msa',`dnl')dnl
dnl FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl
FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl
FEATURE(redirect)dnl
FEATURE(always_add_domain)dnl
FEATURE(use_cw_file)dnl
FEATURE(use_ct_file)dnl
dnl The '-t' option will retry delivery if e.g. the user runs over his quota.
FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl
FEATURE(`access_db')dnl
FEATURE(`blacklist_recipients')dnl
FEATURE(`dnsbl', `sbl.spamhaus.org')dnl
EXPOSED_USER(`root')dnl
MAILER(local)dnl
MAILER(procmail)dnl
MAILER(smtp)dnl
LOCAL_CONFIG
Kcheckaddress regex -a@MATCH
^([0-9]+<@(aol|msn)\.com|[0-9][^<]*<@juno\.com)\.?>
C{RejectToLocalparts} friend you
C{RejectToDomains} public.com
C{RejectToWholestring} Undisclosed.Recipients
LOCAL_RULESETS
HTo: $>CheckTo
SCheckTo
R$={RejectToLocalparts}@$* $#error $: "553 Header error"
R$*@$={RejectToDomains} $#error $: "553 Header error"
R$*$={RejectToWholestring}$* $#error $: "553 Header error" |
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