I keep getting an error message when trying to send mail. It stopped for a
while this morning, and now it's returned. It happens for a test message
that has no attachment and only one word in the message and for a brief
message with an attachment. The error has two parts:

1. The message could not be sent because its size exceeded the server's
limit. You can use the option, located in Tools | Accounts | Properties |
Advanced, to break messages into smaller parts. Subject 'test new', Account:
', Server: '127.0.0.1', Protocol: SMTP, Server
Response: '552 xspR1W0015T45M80000000 This message was undeliverable. This
message has been found to be a potential spam message, and has therefore
been blocked. Please visit http://coxagainstspam.cox.net for more
information.', Port: 25, Secure(SSL): No, Server Error: 552, Error Number:
0x800CCC6D

2. Your server has unexpectedly terminated the connection. Possible causes
for this include server problems, network problems, or a long period of
inactivity. Account: ', Server: '127.0.0.1', Protocol:
SMTP, Port: 25, Secure(SSL): No, Error Number: 0x800CCC0F