Phone : iPhone Carrier : At&T OS version : iOS 5 IMAP Port : 143 POP3 Port : 110 SMTP Port : 587 Setting > Mail > Other > IMAP / POP (either one) - NO SSL > Next > Save IMAP/POP3/SMTP server : mail.yourhosteddomain.com SSL by default is on for both incoming and Outgoing server, make sure to turn this off from 'Advanced' menu older iOS version should have similar setup.
