That's a receive error, not a send error.
Go to Tools, Accounts, select that mail account, Properties, Servers.
Uncheck the box for "Log on using Secure Password Authentication."
--
Gary VanderMolen, MS-MVP (Mail)
"jennymcd" <(E-Mail Removed)> wrote in message news

D941B87-9DE1-4A72-AC37-(E-Mail Removed)...
> this is the message i get can anyone helo me please??
>
> Account: 'yahoo', Server: 'plus.pop.mail.yahoo.com', Protocol: POP3, Server
> Response: '-ERR popgate unknown command', Port: 110, Secure(SSL): No, Server
> Error: 0x800CCC90, Error Number: 0x800CCC18