After some testing, I found inconsistent results when attempting to undelete messages from the Trash folder which were delivered there using one of the three available methods:
- Plus+addressing to user+trash@example.com
- Alias target to user+trash@example.com
- Rule to file into the Trash folder.
I have three Fastmail test accounts. For these three accounts, the results of an undelete of a message filed into the Trash folder by any of the rules above is:
- Account 1: Undeleted to the Sent folder
- Account 2: Undeleted to the Inbox folder
- Account 3: Undeleted to the Inbox folder
I believe that since since the message wasn't originally deleted with a user interface action, the undelete target folder is not well defined. I will send a message to support about this.
Bill