External POP3 clients cannot send mail...

"Mikey" wrote in message
news:

I'm running SBS 2008 & have one user that works from home, using
windows mail.
He can recieve emails, but not send.
I'm getting the message:
Socket error : 10061, Error number 0x800CCC0E
The ports are open on my firewall - what could be the problem?

Has the user been able to send emails via your server previously, or is this
the first time they've tried?

I'd start by looking at whether from the user's pc they can connect to port
25 (SMTP) on your server. If they can then I'd guess its down to
authentication issues - although the resolution will depend on whether or
not they've ever been able to send emails.

To confirm that he/she can connect to port 25 on your server open a command
prompt window on his/her pc (so client's end not at your end) and then type:
telnet sever-dns-name 25
replacing "server-dns-name" with the correct dns name of your server. If
they get a line which identifies your mail server then they can connect to
that port. If it instead indicates that it couldn't connect then the problem
is firewall related - but could still be at the user's end.

I know this is only a start and not the solution, but I hope it helps.
Brian Cryer
http://www.cryer.co.uk/brian