Saw this answer elsewhere and it really helped. I would only change one thing: At the end in the Outgoing Server section, I left username and password blank. When it tried to varify my data it came back with the error message asking if I wanted to try to connect without SSL. I clicked yes and the error came up again, I clicked yes again and it magically worked. Not sure why. Hope this helps.
"Hey Everybody,
Kind of an aside here. Just wanted to post some relevant info for anyone trying to access their Register.com email account via iPhone's POP3 mail application.
i spent over 4 hours with (very helpful) Register.com email folks as well as tier 1 and 2 Apple support trying to figure out this simple issue.
Contrary to the differing instructions from all parties, here's what you need to do:
1) Select POP (not IMAP) when setting up your mail account on the iPhone
2) Enter your name in the "name" field
3) Enter your description in that field
Here's where it gets tricky:
For the incoming Mail Server...
4) For Host Name, enter "mail.yourdomainhere.com"
5) Your User Name is your full email address, not just the prefix before the "@" symbol as they told me. So enter, "justin@justinbroderick.com" for example, not just "justin" as they told me
6) enter your password
Here's where they were wrong again:
For the outgoing SMTP server...
7) enter the exact same settings as you did for the incoming here. So, rather than putting webmail.register.com for the outgoing server as they instructed, put "mail.whateveryourdomainis.com"
8) again, enter all of your user name, not just the prefix for the password field
It should verify correctly. This took me 4 days of trial and error. But it works now.
I know very few people will have a register.com email account. But I wanted to save people the trouble of going through what i went through if you are an account holder.
jb"
