outlook express - emails won't send

[Mike]

I have a file to large to send and has backed up all
pending send email messages. How do I delete the message?

Your server has unexpectedly terminated the connection.
Possible causes for this include server problems, network
problems, or a long period of inactivity. Server: 'smtp-
server.houston.rr.com', Protocol: SMTP, Port: 25, Secure
(SSL): No, Socket Error: 10053, Error Number: 0x800CCC0F