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For example if I've got and mailboxes set up, but someone sends message to I need the message to be stored to a special mailbox and reported (to the sender) as delivered instead of being returned with user-unknown error and discarded.

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up vote 1 down vote accepted

Postfix supports the use of a catchall account using the luser_relay configuration option.

See for more information.

"When the local(8) delivery agent finds that a message recipient does not exist, the message is normally returned to the sender ("user unknown"). Sometimes it is desirable to forward mail for non-existing recipients to another machine. For this purpose you can specify an alternative destination with the luser_relay configuration parameter."

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Just create a catch-all for your local domain as described in

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