Your default root email account:
Every account starts out with a default "catch-all" account for its domain. This email box will grab all mail heading to ANYNAME@yourdomain.com. The login for this box is simply the same main account login you received after signing up. Thus, if your root account is "test@homepage.net" (login of "homepage" - first 8 letters of your domain), there is no need to request an alias to your root account, because all names under your domain already are filtered into this account.
 

Problems resolving your mailhost
If you find that you can't get "mail.yourdomain.com" to resolve as a valid SMTP or POP3 server, please be sure that your domain is registered to our nameservers. Also, try clearing out your cache and cookies and then restarting your computer. in some cases your registration was not completed by the registrar.
 

Any Username And Password Error:
The main cause for this is trying to access the e-mail account with the wrong user / password. If this is NOT your primary e-mail account remember to use the full email address (user@domain.com) as your user name for logging in. If all else fails, simply remove, and then recreate the account with your mail control panel.

If none of this helps, then most likely the pop3 box in question has a received a corrupted message. Contact support and tell them to clear that box out. Usually this results in most or all of that particular mailbox's contents being erased.