There were squirrelmail.org recommended settings in an .htaccess file I created earlier when trying to debug this. Removing that file allowed these errors to display: Warning: Undefined variable $set_thread in /usr/local/www/squirrelmail/functions/mailbox_display.php on line 844 Warning: Undefined variable $thread_name in /usr/local/www/squirrelmail/functions/mailbox_display.php on line 845 -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Unencrypted messages have no legal claim to privacy Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@xxxxxxxxxxxxx Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 ----- squirrelmail-users mailing list Posting guidelines: http://squirrelmail.org/postingguidelines List address: squirrelmail-users@xxxxxxxxxxxxxxxxxxxxx List archives: http://news.gmane.org/gmane.mail.squirrelmail.user List info (subscribe/unsubscribe/change options): https://lists.sourceforge.net/lists/listinfo/squirrelmail-users