Interesting....I learned a lot of new stuff, but in the end Roundcube has it&#39;s own imap functions instead of using the ones built into PHP and they don&#39;t support GSSAPI so I don&#39;t see anyway to do this short of an ugly hack.<div>

<br></div><div>The ugly hack would call for you to extend the HTTP authentication module and modify it to detect when someone has logged on via pubkey...then use the imap_connect event to change the userid/password from the userid for the specific user, to a system userid that has access to everyone&#39;s mailboxes.</div>

<div><br></div><div>The best way to do this would be to extend the imap functions to support gssapi when authenticating.  But that would require hacking the source files.</div>