Chuck,
I wonder if there is something in the SDSL or the route between the clients
and the server, that may be affecting the MTU. The symptoms do fit what I have
seen, all works well, then all of a sudden, they don't. I bet you find that
smaller data transfers are also taking longer.
If you use a mail client on the IMail server, or Web Messaging (again on the
IMail computer) to sent an attachment (eventually, as big as you can!)
locally, does that work OK? This would all take place within IMail and the
local computer, so network would be out of the picture. If this works, then I
think, IMail is working OK.
Check the routers and such for their MTU settings.
Daniel Donnelly
Ipswitch Technical Support
________________________________________________________
See our Knowledge Base at http://support.ipswitch.com/kb
In reply to 1 Dec message from [EMAIL PROTECTED]:
>We have suddenly (in the last day or so) had a problem with users
>complaining that they can't send outbound mail through our iMail 5.07
>server with attachments larger than around 900K. I see no errors in
the
>log, and the spool directory has around 5+ Gbytes free on it.
>All of the users are in (different) virtual domains, with maximum
>mailbox sizes set to 10 meg, max number of messages, 1000, no max
>message size (and this shouldn't make a difference anyway on outbound
>mail, I don't think). It happens whether the target for the message is
a
>local mailbox on our server, or a message bound for another
destination.
>All of the users are using Outlook Express. All of the users have a
>high-speed connection to us via SDSL, and are in our allowed IP address
>range, and are not running SMTP Auth. Not all virtual domains have the
>problem, but all users in a given domain will appear to (I'm still not
>terribly certain of this, but I'm taking their word for it). I can
>(reluctantly) let them talk to a Sendmail 8.8.8 server that we use as
an
>outbound smarthost and they don't have the problem with it. All of
them
>were successfully sending large attachments last week. We have made no
>software changes on the server in the last week.
>I'm completely stumped. Does anyone have any ideas?
>Thanks!
>- Chuck Lawson
>Please visit http://www.ipswitch.com/support/mailing-lists.html to be
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