Please post a copy of the complete error message.
An unknown error has occurred. Subject '', Account: 'pop.charter.net',
Server: 'smtp.charter.net', Protocol: SMTP, Server Response: '421 charter.net
Lost connection to [24.178.143.44]', Port: 25, Secure(SSL): No, Server Error:
421, Error Number: 0x800CCC67
> Please post a copy of the complete error message.
>
[quoted text clipped - 27 lines]
> >> >> My gut tells me it is windows Vista Home Premium since it all started
> >> >> with the new computer.
robertmiles@bellsouthNOSPAM.net - 20 May 2008 00:29 GMT
Unknown errors in Windows Mail are often due to interference from an
antivirus program, antispyware program, or antispam program. List
what programs of those types you have, if any. Also, have you ever had
a Norton or McAfee antivirus program installed on that computer?
Does your connection to that server cross over from one internet
provider's equipment to another's before it reaches the server? If so,
such connections to port 25 are often blocked to cause trouble for
spammers, and you need to ask charter.net if their outgoing mail
server will accept outgoing mail through any other port, and if so,
where to find their instructions for switching over to the other port.
Just trying all the ports is a very slow way to find out, since there
are about 65,000 ports available, and it's unlikely that more than a few
of them will accept outgoing mail. Such a port 25 block is seldom
applied only to mail with attachments, though.
> An unknown error has occurred. Subject '', Account: 'pop.charter.net',
> Server: 'smtp.charter.net', Protocol: SMTP, Server Response: '421
[quoted text clipped - 42 lines]
>> >> >> started
>> >> >> with the new computer.
tikijenn - 20 May 2008 01:34 GMT
The computer has AVG on it and has never had another. My connection to the
server does not cross over another provider. We disabled AVG long enough to
try to send another email with photo attachments and that still didn't work.
Do you have any other suggestions?
> Unknown errors in Windows Mail are often due to interference from an
> antivirus program, antispyware program, or antispam program. List
[quoted text clipped - 58 lines]
> >> >> >> started
> >> >> >> with the new computer.
robertmiles@bellsouthNOSPAM.net - 20 May 2008 01:54 GMT
Did you use the standard install for AVG? If so, it often helps to
uninstall
it, then do a custom install where you tell it to leave out the part that
scans
email.
http://free.grisoft.com/ww.download?prd=afe
> The computer has AVG on it and has never had another. My connection to
> the
[quoted text clipped - 71 lines]
>> >> >> >> started
>> >> >> >> with the new computer.
Gary VanderMolen - 20 May 2008 03:12 GMT
Looks like a server time-out because your AVG is causing a delay
by scanning the attachment. Like Robert suggested, uninstall/reinstall
AVG without its email scanning module.

Signature
Gary VanderMolen, MS-MVP
> An unknown error has occurred. Subject '', Account: 'pop.charter.net',
> Server: 'smtp.charter.net', Protocol: SMTP, Server Response: '421
[quoted text clipped - 42 lines]
>> >> >> started
>> >> >> with the new computer.