Outlook loging me out of my outgoing server???

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I called tech support for my website host (who also does email). I was
getting an email after sending that said the message couldn't be delivered,
followed by this line: "553 sorry, that domain isn't in my list of allowed
rcpthosts (#5.7.1)"

A google search revealed that this is usually a server-side problem.
However after the tech support rep looked at/tried some things on their end.
She had me do a little test in Outlook (using Office XP on this machine BTW).
She had me try and send an email. I got the usual undeliverable email in
return almost immediately. She then had me close Outlook, reopen it, and try
sending again. This time it succeded, and now, an hour later, still no
undeliverable email returned. So I'm fairly certain it worked.

Here's the question: she said that for some reason Outlook is logging out of
my outgoing server, and that as long as it stays logged in, everything is
fine. But, after Outlook has been open a while, it loggs out or times out or
something, and then the email doesn't pass the server, and I get the error
email. The easy fix is just clicking Send/Receive everytime before clicking
the send button in the email to be sent. Is there a way to keep Outlook
logged in or keep it from timing out??? I can't seem to find any settings
related to this, and wondered if any of you Outlook guru's could help or
point me in the right direction???

Thanks in advance for any help. --the Fiddler

.

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