The error message you included pertains to receiving, not sending.
Go to Tools, Accounts, select that mail account, Properties, Servers.
Make sure that "Log on using Secure Password Authentication" is NOT enabled.
If you also have send issues, be sure to post the send error.
--
Gary VanderMolen, Microsoft MVP (Mail)
http://mvp.support.microsoft.com/def...le/vandermolen
"athena" <> wrote in message news:00E85EC7-0CA8-4D2F-BD87-...
> First I was having problems receiving emails, that problem is fixed but now I
> can't send? I have changed all the settings as advised from this site, but no
> luck... here's the error
> Account: 'pop-server.columbus.rr.com', Server:
> 'pop-server.columbus.rr.com', Protocol: POP3, Server Response: '-ERR An
> authentication mechanism MUST be entered', Port: 110, Secure(SSL): No, Server
> Error: 0x800CCC90, Error Number: 0x800CCC18