Mail lists lots of headers but mozilla does not see any imap mail

[J F <j1234f@excite.com>]

Mail lists lots of headers but mozilla does not see any imap mail.
~$ mail
Mail version 8.1.2 01/15/2001.  Type ? for help.
"/var/mail/jf": 118 messages 118 new
>N  1 attbroadband@attb  Sat Jun 14 11:52  192/12701 Time Sensitive Information Regarding your 
ATTBI E-mail Account
...

I can see imap is running at port 143.

root#  nmap 10.0.0.9

Starting nmap 3.27 ( www.insecure.org/nmap/ ) at 2003-06-14 12:33 PDT
Interesting ports on a1700xp.ebeb.com (10.0.0.9):
(The 1615 ports scanned but not shown below are in state: closed)
Port       State       Service
22/tcp     open        ssh
25/tcp     open        smtp
111/tcp    open        sunrpc
139/tcp    open        netbios-ssn
143/tcp    open        imap2
445/tcp    open        microsoft-ds
631/tcp    open        ipp
3000/tcp   open        ppp

Nmap run completed -- 1 IP address (1 host up) scanned in 1.666 seconds

It even responds sort of:
root@a1700xp:/etc# telnet 10.0.0.9 143
Trying 10.0.0.9...
Connected to 10.0.0.9.
Escape character is '^]'.
((It pauses a few seconds and then))
Connection closed by foreign host.