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When using squirrelmail with an imap backend, tacking advantage of the deleted flag of imap to mark messages as deleted (instead of moving them to a trash folder and losing message organisation), there is no way to unset this flag if it was set prematurely That means one can not rescue a message before the folder is purged Please make the delete button unset the delete flag if the selected message is already deleted (like other mail clients do)
Filed upstream https://sourceforge.net/tracker/?func=detail&aid=3522546&group_id=311&atid=350311
based on upstream comment, I've added undelete plugin in squirrelmail rpm http://squirrelmail.org/plugin_view.php?id=86
Thanks a lot !