Sieve will not reply to mail it doesn't think was sent directly to a user.

I use an SQL auth backend, and a user might login as user1@domain.com.

What method can I use to inform dovecot that user2@domain.com is a forward to user1@domain.com, such that the vacation auto response will fire when user2@domain.com is emailed (therefore, the mail ends up in user1@domain.com's mailbox).

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