Mail.app + SMTP oddity...

Hello all,
Several users at the college I work for are reporting a sudden breakdown of SMTP services using Mail.app under 10.4.x.
All clients were previously functioning, but suddenly stopped being able to send (they get the "could not send from this smtp server... yadda yadda" message).
All are configured with accounts on our server, so it's not a port 25 blocking issue.
It's only Mail.app clients that are having the problem (PCs seem to be unaffected).
And, the really maddening part is that it seems to be intermittent in some cases but not in others.
It's happening from a variety of Mac models, but the are all running some variant of 10.4.
In some cases we did system maintenance on the machines and deleted Mail.app's preference files to no avail.
Our SMTP server is Redhat Linux.
Any thoughts would be very helpful. We're at a loss!
Thanks!
Various   Mac OS X (10.4)  

Welcome to the discussions, paul.
Can you run ethereal or similar to see what is happening between the machines and the server?
AK

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