automation can be very useful. However, with programming, one size
does not fit all. There are always exceptions to the Rules.
select a conversation and Ignore (exclude) it from the Clean
Try it: Ignore a Conversation
You will be prompted twice.
This action will apply to all items in the selected conversation.
The selected conversation and all future messages will be moved
to the Deleted Items folder.
the the Clean Up runs, this Conversation will not be trashed.