re-mapping incoming email

[Manfred Bartz]

I retrieve email for a virtual domain hosted elsewhere with fetchmail
which then connects to my local qmail via SMTP.  All email from that
source then goes to one local account.

I would like to have the system look at the ``X-Envelope-To:'' header
(which is kindly provided by the hosting company) and redirect email
accordingly to various different local accounts.

What would be the best way of doing this?

-- 
Manfred Bartz