This is my corrected configuration file for squirrelmail over ssl
if anyone is interested:
# squirrelmail.conf 2005 May 13 James B. Byrne JBB8
#
# SquirrelMail is a webmail package written in PHP.
# This configuration file forces users to connect via SSL
#
# If the incoming request is already https:// then this
# file will only be processed if the directive:
#
# Include /etc/httpd/conf.d/squirrelmail.conf
#
# is appended to ssl.conf for the default server or added
# to the virtual host configuration file of the virtual
# host used to process webmail. Note that ssl requires
# IP addressed virtual hosts to work and that the necessary
# Listen directives must be placed in the appropriate
# configuration files as well.
#
Alias /webmail /usr/share/squirrelmail
<Directory /usr/share/squirrelmail>
AllowOverride None
Options ExecCGI
Order allow,deny
Allow from all
</Directory>
RewriteEngine on
RewriteLog "/var/log/httpd/rewrite_log"
RewriteLogLevel 0
# AIDE-MEMOIRE
# Arguments $1, $2 etc. refer to () matches in the
# CURRENT RewriteRule line.
# Arguments %1, %2 etc. refer to () matches in the
# LAST matched RewriteCond.
# Do not process established ssl squirrelmail sessions
RewriteCond %{HTTPS} on
RewriteCond %{REQUEST_URI} ^/webmail(/?|/.*)$
RewriteRule (^.*$) - [L,R]
# Rewrite short form URLs whether SSL or not for forms
# webmail.anything.dom and www.webmail.anything.dom
RewriteCond %{HTTP_HOST} ^(www\.)?(webmail\.)(..+\.)(..+)$ [NC]
RewriteCond %{REQUEST_URI} !^/webmail/
RewriteRule (^.*$) https://webmail.%3%4/webmail/ [L,R]
# Force SSL otherwise
RewriteCond %{HTTPS} off
RewriteCond %{REQUEST_URI} ^/webmail(/?|/.*)$
RewriteCond %{HTTP_HOST} ^(.*\.)?(..+\.)(..+)$ [NC]
RewriteRule (^.*$) https://webmail.%2%3/webmail/ [L,R]
#EOF
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