We are currently migrating our mail system from Exchange 2003 to Exchange 2010. Tomorrow is deployment day. Mailbox configuration and everything is fine. The only thing that is still not a 100% is POP / mobile email. We are not using SSL or any secure certificates. For test purpose, i tried configuring a test account on the new server to an iPhone and an Android device. Initially, i was unable to configure POP account on these phones. I would set the incoming mail server address (smtp.xxxx.com) and port (25) and enter the outgoing (same smtp.xxxx.com and port 110) and it would say "unable to authenticate outgoing server". But I was able to finish configuring if I chose "Outgoing does not require authentication". But then I can receive emails, but not send emails. Currently, for our accounts in Exchange 2003, I use the same settings:
Incoming server: smtp.xxxx.com, port:25, outgoing same server and port:110. and they work fine. Is there any additional thing I need to set on Exchange 2010 to be able to authenticate outgoing emails from phones? Please help as tomorrow is deployment day.