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I'm hoping to take advantage of authentication caching via dovecot-auth. I see that posfix can communicate with Dovecot-Auth, via SASL, but from what I can see, postfix only does this for authentication checks. Not 100% sure how postfix handles virtual_transport (I assume it needs to do a lookup via virtual_mailbox_maps), but I can't see anyway to get virtual_mailbox_maps to use