IIS and SMTP - Large attachments stops subsequent mail delivery

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Author Large attachments stops subsequent mail delivery
security-man

2005-03-04, 2:48 am

HI All
We have Microsoft SMTP service running on win2003 acting as a mail
relay to our internal Notes server. Mail from internet to our internal
domains work fine. I see issues when Notes server forwards mail to SMTP
server to deliver outbound mail. The symptoms are when an internal user
tries to send mail with attachments >9.5MB SMTP service does not
deliver the mail. Another interesting observation is that any
subsequent mail of any size from our internal users to anywhere on the
internet does not get delivered as well. The only way to resolve this
is by deleteing the mail with large attachment from Notes server and
then mail flows normally until the time when users try sending mail
with a large attachment.
Is this something to do with the Maximux session size parameter in the
SMTP services console.
Can anyone give me some insight into what may be going on and how it
can be resolved.

Thanks in advance
Ravi

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