I figured the problem out. The issue was that the PIX 505 firewall had fixup enabled on SMTP 25. This was keeping outside mail clients from authenticating with the Exchange server. I new the firewall was passing mail on port 25 so I didn't initially think it could be the problem.
For anyone...
Yeah, I hate POP and IMAP myself so I wouldn't use it unless I had to. This exercise I'm going through is for the owner of a small business that has an iPhone. I could get it to receive mail but not send (with exchange), so I setup Outlook Express with IMAP to test the problem. Once I get...
I manage a Windows 2003 SBS w/Exchange SP2 server. I'm trying to get Outlook Express to connect from an off-site location (IMAP/SMTP). I get IMAP folders and download mail fine. When I try to send an e-mail to an outside domain I get an SMTP error "550 5.7.1 unable to relay for *@*.com".
I...
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