When I enter my existing email accounts, It says invalid credentials. What can I do?
Are you talking about Setting them up NEW on the phone? or accessing them after already set up? Sounds like you have an invalid user id or password. just a thought.
for my cox, pop3 account, the login for the pop3 & smtp server is xxxx BUT NOT @COX.NET.
both of my servers require authentication & secure/ssl
& do make sure the pop & smtp server addresses are correct.