username mapping for imap/pop

[bidwell]

Thank you.  That is what I thought and have implimented.  Tracing the
problem further, my imap connection successfully authenticates and then gets
a "connection closed by foreign host" going through nginx.  The pop
connection works just fine, but imap fails.

I have nginx configured to enter on port 143 and go out to 127.0.0.1:143
where it goes through stunnel to go to imap.gmail.com:993.  If I talk
directly to 127.0.0.1:143 (to stunnel) it works.  If I talk to nginx, it
authenticates, logs correct username, target IP and port, gets the
Capability list and registers a successful login to the remote (gmail) imap
server and then closes the connection immediately.  The following is a
transcript of the telnet session:

telnet nginx:143
* OK IMAP4 ready
a1 LOGIN user at example.com password
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN
X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH
a1 OK user at example.com first_name Last_name authenticated (Success)
Connection closed by foreign host.

Any suggestions as to what to try next to diagnose this?  (Thanks in
advance)

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,246296,246341#msg-246341