We have a few users that have cell phones in Europe like the nokia 9100 that can send/receive via pop3 or IMAP4.
I have setup Exchange and ISA to allow IMAP, and they can sync their mail just fine. But they cannot send email out via that account through their phones.
Their IMAP settings are:
inbound server - mail.domain.com
outbound server - mail.domain.com
SMTP server requires authentication = YES
username, password, etc.
Any ideas on why outbound wouldn't work? Is it possible that it works similar to home ISP's in that you have to use their outbound mail servers? That's about the only thing I can think of at this point.