I have shuffled through all the posts around here on this topic but I can't find an answer that works for me.
I'm running a multiple domain exchange 03 server.
I have 2 separate email accounts for myself within exchange with 2 separate user accounts. My main business account is setup as an exchange account in outlook 03. My secondary account is setup as an IMAP account in the same profile. When sending mail from the imap account I get the relaying error. Under relaying I have all the right stuff set. Only the list below (it's an empty list) and allow computers which successfully authenticate to realy. It used to relay, I have been using this account for almost a year now, and all the sudden this problem has cropped up. Using the account through outlook web access I can send mail fine. Using exchange I can send mail fine, but using imap I get this error.