[enhancement]: Mail "symbolic" links

[X-Ryl669]

Which feature or improvement would you like to request?

In JMAP specification an email can exists in multiple mailbox simultaneously (see mailBoxIds). This is useful to mimic Gmail's tag or label by using folders.

Ideally, I can sort an email in multiple folder via sieve script by using multiple fileinto clauses, but then I have copies of the mail, so deleting the mail from one folder leaves it in the other folder.

I wonder if it would be possible to add an extension to fileinto called :link so instead of copying the mail, it changes its mailboxid property to include both mailbox's id (one for each folder). That way, deleting the mail in whatever folder will actually delete it since it only exists once.

Is your feature request related to a problem?

Not able to have a unique mail appears at multiple place in the inbox hierarchy.

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