Package: courier-imap-ssl
Version: 3.0.8-13
Severity: normal

TLS/SSL session caching, an experimental feature, is activated by
default. 

It causes issues with Mozilla Thunderbird MUA v1.0.7 and
v1.5.x, if the client uses SSL connection and 'Maximum number of server
connections' set set to a value higher than 1. The MUA's default setting
of this value is '5'. Please review
https://bugzilla.mozilla.org/show_bug.cgi?id=333661 and related bugs for
additional information on this issue.

I consider this a problem with courier-imap-ssl as 
- this problem occurs only in combination with a server side 
  functionality marked as experimental
- is only known to occur incombination with courier-imap daemons

My suggestion for a fix is to deactivate session caching by default and 
to add a note explaining which errors this may cause and/or to add a 
link to the Mozilla bug ID where this issue is discussed:
https://bugzilla.mozilla.org/show_bug.cgi?id=333661

A better fix would be to make the imap daemon return an error message to
the client before disconnecting so the client is able to know why the
connection was dropped.

Thanks for investigating this.

-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 
'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.16-1-k7
Locale: [EMAIL PROTECTED], [EMAIL PROTECTED] (charmap=ISO-8859-15)

Versions of packages courier-imap-ssl depends on:
ii  courier-imap                  3.0.8-13   Courier Mail Server - IMAP server
ii  courier-ssl                   0.47-13    Courier Mail Server - SSL/TLS Supp
ii  openssl                       0.9.8a-8   Secure Socket Layer (SSL) binary a

courier-imap-ssl recommends no packages.

-- no debconf information


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