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SMTP timing out on some incoming mails

Posted on 2004-09-16
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Hi

I have a client using MS SBS 2000 with exchange server - using DSL and a backup email server.

The problem is that most of the incoming mail is getting through but the rest is timing out. When this happens it is then queues on the backup email server nd when it tries to send again it also gets a time out.

I have switched on the SMTP log and the offending mails have a HELO,MAIL,RCPT,TIMEOUT,QUIT .

Exchange is not filtering any address - the firewall is not filtering any content or addresses.

Anyone any ideas

Thanks is Advance

Paul
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Question by:Paddyo
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Expert Comment

by:tztrh
ID: 12073655
what about anti virus software. I had similar problems when NOD32 scaned my incomming mail.
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Author Comment

by:Paddyo
ID: 12073720
Im using Sophos Small Business Suite, (Sophos Antivirus and Puremessage spam filter)
I have tried stopping checking for spam - same result. Usually if a virus or spam is found it is quarintined.

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Expert Comment

by:tztrh
ID: 12074533
what about limits on your incomming messages? try setting it to no limit and then check. can you post some logs about this matter
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Author Comment

by:Paddyo
ID: 12074700
There are no limits set for imcoming mails.

I will try to get the revelant part of the smtp log.

Thanks
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Author Comment

by:Paddyo
ID: 12074749
Part of SMTP log file

2004-09-15 21:05:37 217.114.167.253 irishdomains.net SMTPSVC1 2KSERVER 192.168.0.1 0 EHLO - +irishdomains.net 250 0 327 21 16 SMTP - - - -

2004-09-15 21:05:37 217.114.167.253 irishdomains.net SMTPSVC1 2KSERVER 192.168.0.1 0 MAIL - +FROM:<Stephanie.Fitzpatrick@ORIFLAME.ie> 250 0 58 64 0 SMTP - - - -

2004-09-15 21:05:37 217.114.167.253 irishdomains.net SMTPSVC1 2KSERVER 192.168.0.1 0 RCPT - +TO:<jackie@inspection.ie> 250 0 33 51 0 SMTP - - - -

2004-09-15 21:07:25 217.114.167.253 irishdomains.net SMTPSVC1 2KSERVER 192.168.0.1 0 TIMEOUT - irishdomains.net 121 4255609561 84 4 600781 SMTP - - - -
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Author Comment

by:Paddyo
ID: 14315785
I should have commented earlier on this one - apologies

The answer believe or not was the MRU/MTU settings on an ADSL router and a firewall. They were at different settings. Once I set them to the same figure everything worked perfectly.
Paddyo.
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