According to your ISP:
http://www.comcast.net/help/faq/inde...=Emailtop17686
the outgoing mail server should be on port 587, not on port 25
as you have it.
Gary VanderMolen
"Jciplev" <Jciplev@discussions.microsoft.com> wrote in message news:ADD442E1-CA97-4781-AE9C-7BA97A8785DC@microsoft.com...
> When I go to send an outgoing mail message, it gets to the Outbox and Windows
> Mail blows up there. I get the following error message: "Your server has
> unexpectedly terminated the connection. Possible causes for this include
> server problems, network problems, or a long period of inactivity. Subject
> 'Testing', Account: 'mail.comcast.net', Server: 'SMTP.comcast.net', Protocol:
> SMTP, Port: 25, Secure(SSL): No, Socket Error: 10053, Error Number:
> 0x800CCC0F". I noticed there are several other people within this community
> having the same problem.
>
> Note I have deleted all mesaages from the my inbox, outbox sent items, draft
> and delete items boxes. The problem still persists. Is this a bug? If so,
> when will it be fixed?