I have a system connected to a cable modem. It was able to send mail fine for some time, then it suddenly stoped working. I can't seem to find what is wrong. I sent an email with the -v option and it looks like it is connecting OK. I'm not getting any returned emails.

Output below: (changed the system name to xxxx)

[jadams@xxxx jadams]$ mail -v quincy56@aol.com
Subject: test
test
Cc:
quincy56@aol.com... Connecting to mail.attbi.com. via relay...
220 rwcrmhc51.attbi.com ESMTP server (InterMail vM.4.01.03.27 201-229-121-127-20010626) ready Tue, 27 Aug 2002 01:21:32 +0000
>>> EHLO xxxx.ne2.client2.attbi.com
250-rwcrmhc51.attbi.com
250-HELP
250-XREMOTEQUEUE
250-ETRN
250-PIPELINING
250-DSN
250 SIZE 10485760
>>> MAIL From:<jadams@xxxx.ne2.client2.attbi.com> SIZE=41
250 Sender <jadams@xxxx.ne2.client2.attbi.com> and extensions (SIZE=41) Ok
>>> RCPT To:<quincy56@aol.com>
250 Recipient <quincy56@aol.com> Ok
>>> DATA
354 Ok Send data ending with <CRLF>.<CRLF>
>>> .
250 Message received: 20020827012133.NFLE14185.rwcrmhc51.a...ent2.attbi.com
quincy56@aol.com... Sent (Message received: 20020827012133.NFLE14185.rwcrmhc51.a...ent2.attbi.com)
Closing connection to mail.attbi.com.
>>> QUIT
221 rwcrmhc51.attbi.com ESMTP server closing connection
[jadams@xxxx jadams]$