Did you try the fix I suggested?
Gary VanderMolen, Microsoft MVP (Mail)
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"Mary Winters" wrote in message news

91601F6-1B04-4C53-8343-(E-Mail Removed)...
It is the same with my emails. I cannot get rid of one to British Gas and now
every message I send goes into outbox instead of being sent. I have had 2
sessions with BT Broadband help service and been to 2 E.T. shops but no-one
can get rid of this message. Please help.
WMW
"Chris22" wrote:
> I am using Windows Vista with Windows Mail and logged in this morning and
> clicked send/receive and it came up with this message:
>
> An unknown error has occurred. Account: 'Chris @ Home', Server:
> 'mail.btinternet.com', Protocol: POP3, Port: 110, Secure(SSL): No, Error
> Number: 0x80004005
>
> How can I get rid of it? I have uninstalled Nortons Internet Security and it
> still happens. Please help.
>
> Thanks