Hi,

I have a setup with me where I'm using nginx to talk to a redirector
(embedded perl script) which redirects IMAP/POP communication to the
appropriate IMAP/POP server based on a simple DB query that says "this
user's emails are on that IMAP server".
I'm not doing any authentication at this level since according to
this[1] request-timeline diagram, the authentication request/response
is done again with the actual IMAP server anyway.

When my IMAP client is trying to authenticate with legitimate username
and password, nginx - as expected according to the diagram - delegates
the ". login username@domain password" to the real IMAP server whose
". OK" is relayed back to the IMAP client by nginx.
The problem I'm facing right now is when I provide the wrong password,
IMAP server returns AUTHENTICATIONFAILED, but nginx thinks it's an
invalid response and cuts off the session with the IMAP client.

In nginx error log:

> 2010/03/23 14:43:53 [info] 12550#0: *29 upstream sent invalid response: "* BAD internal server error" while reading response from upstream, client: xx.xx.xx.xx, server: 0.0.0.0:143, login: "username@domain", upstream: yy.yy.yy.yy:143

an example telnet session:

[root@nginx ~]# telnet localhost 143
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
* OK IMAP4 ready
+ login username@domain wrongpassword
* BAD internal server error
Connection closed by foreign host.
[root@nginx ~]#

The behaviour I expect is:

[root@nginx ~]# telnet localhost 143
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
+ login username@domain wrongpassword
+ NO [AUTHENTICATIONFAILED] Authentication failed.
<telnet session doesn't close>

How do I go about configuring nginx to support this?
'proxy_pass_error_message on' didn't help.
Where exactly do I look in the source to make the appropriate changes?

Thanks!
-Naresh.

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