This has never happened before.  I can receive, but as of today, cannot send 
email.  I am running Microsoft vista home premium, and windows mail.  I 
didn't change any settings, and it was working fine yesterday.  Here is my 
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 'test', Account: 'mail.comcast.net', Server: 
'smtp.comcast.net', Protocol: SMTP, Port: 25, Secure(SSL): No, Error Number: 
0x800CCC0F

Can anyone help me?  I have turned off my anti-virus program scan of 
outgoing mail, but that did not do anything.

Change the SMTP port to 587 and make sure: My Server Requires 
Authentication is checked.

How do I set up/configure Outlook Express & Windows Mail for Comcast 
email?
http://www.comcast.com/customers/faq/FaqDetails.ashx?Id=2288
-- 
           Bruce Hagen
         MS-MVP [Mail]
      Imperial Beach, CA


"hope les" <hope les@discussions.microsoft.com> wrote in message 
news:A87CAD24-2D96-4CFB-AE38-D11CA5DED98C@microsoft.com...
> This has never happened before.  I can receive, but as of today, cannot 
> send
> email.  I am running Microsoft vista home premium, and windows mail.  I
> didn't change any settings, and it was working fine yesterday.  Here is 
> my
> 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 'test', Account: 'mail.comcast.net', Server:
> 'smtp.comcast.net', Protocol: SMTP, Port: 25, Secure(SSL): No, Error 
> Number:
> 0x800CCC0F
>
> Can anyone help me?  I have turned off my anti-virus program scan of
> outgoing mail, but that did not do anything. 

Thank you, Bruce.  I can now send email again after making the changes you 
suggested.  Can you just tell me, why did everything work yesterday as it was 
set up, and stop working today?  Why did I need to change these settings 
today?  

"Bruce Hagen" wrote:

> Change the SMTP port to 587 and make sure: My Server Requires 
> Authentication is checked.
> 
> How do I set up/configure Outlook Express & Windows Mail for Comcast 
> email?
> http://www.comcast.com/customers/faq/FaqDetails.ashx?Id=2288
> -- 
>            Bruce Hagen
>          MS-MVP [Mail]
>       Imperial Beach, CA
> 
> 
> "hope les" <hope les@discussions.microsoft.com> wrote in message 
> news:A87CAD24-2D96-4CFB-AE38-D11CA5DED98C@microsoft.com...
> > This has never happened before.  I can receive, but as of today, cannot 
> > send
> > email.  I am running Microsoft vista home premium, and windows mail.  I
> > didn't change any settings, and it was working fine yesterday.  Here is 
> > my
> > 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 'test', Account: 'mail.comcast.net', Server:
> > 'smtp.comcast.net', Protocol: SMTP, Port: 25, Secure(SSL): No, Error 
> > Number:
> > 0x800CCC0F
> >
> > Can anyone help me?  I have turned off my anti-virus program scan of
> > outgoing mail, but that did not do anything. 
> 
> .
> 

Comcast started blocking port 25 about two years ago, but is applying it 
gradually to their customers.

If I were you, I'd give them hell for not notifying you.
-- 
           Bruce Hagen
         MS-MVP [Mail]
      Imperial Beach, CA


"hope les" <hopeles@discussions.microsoft.com> wrote in message 
news:B34BD0E0-3EBD-452D-8E25-77BB6F542BCD@microsoft.com...
> Thank you, Bruce.  I can now send email again after making the changes 
> you
> suggested.  Can you just tell me, why did everything work yesterday as 
> it was
> set up, and stop working today?  Why did I need to change these settings
> today?
>
> "Bruce Hagen" wrote:
>
>> Change the SMTP port to 587 and make sure: My Server Requires
>> Authentication is checked.
>>
>> How do I set up/configure Outlook Express & Windows Mail for Comcast
>> email?
>> http://www.comcast.com/customers/faq/FaqDetails.ashx?Id=2288
>> -- 
>>            Bruce Hagen
>>          MS-MVP [Mail]
>>       Imperial Beach, CA
>>
>>
>> "hope les" <hope les@discussions.microsoft.com> wrote in message
>> news:A87CAD24-2D96-4CFB-AE38-D11CA5DED98C@microsoft.com...
>> > This has never happened before.  I can receive, but as of today, 
>> > cannot
>> > send
>> > email.  I am running Microsoft vista home premium, and windows mail. 
>> > I
>> > didn't change any settings, and it was working fine yesterday.  Here 
>> > is
>> > my
>> > 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 'test', Account: 'mail.comcast.net', Server:
>> > 'smtp.comcast.net', Protocol: SMTP, Port: 25, Secure(SSL): No, Error
>> > Number:
>> > 0x800CCC0F
>> >
>> > Can anyone help me?  I have turned off my anti-virus program scan of
>> > outgoing mail, but that did not do anything.
>>
>> .
>> 

Thanks again - as you can tell, I not only wanted to know what the fix was, 
but also why it was broken.  And your answer makes me realize once again, 
that Comcast is not comcastic.  I haven't had as many internet problems as I 
have cable problems, but they can be frustrating, and where I live, I do not 
have an alternative cable company.  I spent a good deal of time today trying 
to figure this out, and some timely info from them would have apparently 
averted that.

"Bruce Hagen" wrote:

> Comcast started blocking port 25 about two years ago, but is applying it 
> gradually to their customers.
> 
> If I were you, I'd give them hell for not notifying you.
> -- 
>            Bruce Hagen
>          MS-MVP [Mail]
>       Imperial Beach, CA
> 
> 
> "hope les" <hopeles@discussions.microsoft.com> wrote in message 
> news:B34BD0E0-3EBD-452D-8E25-77BB6F542BCD@microsoft.com...
> > Thank you, Bruce.  I can now send email again after making the changes 
> > you
> > suggested.  Can you just tell me, why did everything work yesterday as 
> > it was
> > set up, and stop working today?  Why did I need to change these settings
> > today?
> >
> > "Bruce Hagen" wrote:
> >
> >> Change the SMTP port to 587 and make sure: My Server Requires
> >> Authentication is checked.
> >>
> >> How do I set up/configure Outlook Express & Windows Mail for Comcast
> >> email?
> >> http://www.comcast.com/customers/faq/FaqDetails.ashx?Id=2288
> >> -- 
> >>            Bruce Hagen
> >>          MS-MVP [Mail]
> >>       Imperial Beach, CA
> >>
> >>
> >> "hope les" <hope les@discussions.microsoft.com> wrote in message
> >> news:A87CAD24-2D96-4CFB-AE38-D11CA5DED98C@microsoft.com...
> >> > This has never happened before.  I can receive, but as of today, 
> >> > cannot
> >> > send
> >> > email.  I am running Microsoft vista home premium, and windows mail. 
> >> > I
> >> > didn't change any settings, and it was working fine yesterday.  Here 
> >> > is
> >> > my
> >> > 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 'test', Account: 'mail.comcast.net', Server:
> >> > 'smtp.comcast.net', Protocol: SMTP, Port: 25, Secure(SSL): No, Error
> >> > Number:
> >> > 0x800CCC0F
> >> >
> >> > Can anyone help me?  I have turned off my anti-virus program scan of
> >> > outgoing mail, but that did not do anything.
> >>
> >> .
> >> 
> 
> .
>