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Postfix virtual_alias_maps and virtual_mailbox_maps delivery to Dovecot

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I have a working Postfix setup where I can deliver incoming mails to both a Dovecot mailbox, and forward on those mails to an external address. However, this doesn't feel right, and I'd appreciate a sanity check.

The Postfix main.cf includes both virtual_alias_maps and virtual_mailbox_maps. Assume that I'm handling mails for pg@example.com, and that

  1. These emails have to be delivered to Dovecot mailbox mbox, and
  2. These emails must also be forwarded to pg@foo.com

In virtual_alias_maps I originally had:

pg@example.com  pg@example.com, pg@foo.com

And in virtual_mailbox_maps I originally had:

pg@example.com  example.com/mbox/

This seemed logical to me, but didn't work. The mails are forwarded to pg@foo.com Ok, but Dovecot delivery fails, with a bounce. I managed to fix this by changing virtual_alias_maps to:

pg@example.com  mbox@example.com, pg@foo.com

And changing virtual_mailbox_maps to:

mbox@example.com  example.com/mbox/

I'm not really happy with this because it doesn't seem to fit in with any documentation I've found. As far as I can see, virtual_mailbox_maps is meant to map an address to a mailbox, and not a mailbox to a mailbox. Am I doing this the right way, or is there a better way to do this?

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