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Outlook 2002.
I cannot send replies to messages from my IMAP account anymore --
even
if I click Accounts use my other pop3 account. All my replies
to
IMAP messages come back with a message failure, saying the recipient
has been graylisted. When I check on details, it looks like System
administrator has done the graylisting. So I don't know if the
problem is my machine or the recipient's machine.

Does Outlook provide settings for graylisting?
How can I fix this problem?


No e-mail client can provide greylisting. That is a function provided
by the recieving mail host. Go read:

http://en.wikipedia.org/wiki/Greylisting