I have an IMAP user on another network connecting to an Exchange 5.5 server. I want them to be able to use the same server to send mail as well. I have configured the IMC (5.5/sp4) with the accept connections (authenticate) and only from users homed on this server. their mailboxes are on this server. they can recieve fine but all outgoing mail gets the 550 relaying denied. I did the disable ESMTP registry hack hoping this would help with the KB article reference to the Cisco PIX firewall and not being able to handle the EAUTH command from ESMTP. No dice however. I have no way of contacting the owner of the network to see if a Cisco PIX even exists . . . any other suggestions? I dont want to just let the SMTP open in this day and age . . .
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