Webmail - undelete option for sent items

since our mail journal, emal bkp, is incoming, would be nice a way to have a bkp of last x days, so one can undelete outbound mails.

a soft delete option. So when someone removes any mail item from any folder, we don't actually delete it, but keep it for 7 days just in case. This will allow us to reverse cases such as this one, within 7 days.

see #208252

Approved