When adding an Mail Filter to a mailbox (as admin, reseller or client) there are many more options for the source, operator and action than are available when the mailbox user logs in. mail users should have the same options.
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Indeed, there are other things added to 'mail' which need copied to 'mailuser' - I didn't realize that was a different section of code and was just about to create another.
Right offhand I see the no_policy text should change to inherit_policy, and recent autoresponder changes to make the start and end dates optional didn't get changed here. Checking other screens it looks like the 'move to junk' as well as purge trash/junk days settings need duplicated, too.
I noticed the move to junk and purge trash/junk missing aswell, but I decided to let it be for now since it's not a easy copy paste and done.
But maybe we should consider changing the way the mailuser works, or do a regular check up if everything is up to date, and maybe tell people who create new MR's to include their changes for the mailuser.
I will add the no_policy text and see if it is a easy thing to copy the new autoresponder code.