Alias with check_recipient_access: /etc/ppostfix/virtual sensible solution?

4 msg	Forwards vs aliases ?
4 msg	no content-filter for authed users
2 msg	postfix does not flush queued mails
1 msg	Re: [dkim-milter-beta] mlfi_negotiate() problem
2 msg	newby Q
14 msg	PAM 'smtp' file question
5 msg	Cyrus SASL2 + Postfix + PAM - part 3
9 msg	transport error?
3 msg	Can't figure out if this rejection is coming fr...

Alias with check_recipient_access: /etc/ppostfi...
\ Raimund Eimann (14 Nov 2007)
. \ (Wietse Venema) (14 Nov 2007)
. . \ Raimund Eimann (14 Nov 2007)
. . . \ Sahil Tandon (15 Nov 2007)
. . . . \ Raimund Eimann (15 Nov 2007)
. . . . . \ Francesco Abeni (15 Nov 2007)
. . . . . \ Gerard (15 Nov 2007)
. . . \ (Wietse Venema) (15 Nov 2007)

2 msg	NDR reports
7 msg	Sender-ID and the Hotmail devil...
2 msg	Postifx with IMAP
2 msg	Postfix and procmail
4 msg	destination limits - what is 'destination'
1 msg	Redirect message based on Conditions
1 msg	Cyrus SASL2 + Postfix + PAM - part 2
6 msg	Cyrus SASL2 + Postfix + PAM
5 msg	header_checks and content_filter documentation ...
2 msg	Some problem configuring postfix/procmail with ...

Subject:	Alias with check_recipient_access: /etc/ppostfix/virtual sensible solution?
Group:	Postfix-users
From:	Raimund Eimann
Date:	14 Nov 2007

Hi,

I'm rejecting mail to users such as root, hostmaster, administrator and so on
on my mail server. Apart from that, mail to unknown users is rejected.

For one user (username: "mike"), I need an alias "michael". As "michael" does
not exist in /etc/passwd mail to michael gets rejected.

I added some entries to /etc/postfix/virtual:

michael mike
michael mike
michael mike

It seems to work, but is this the correct way of doing this? Or is this rather
done in /etc/aliases or /etc/postfix/canonical?

Confused. What's the relevant section in the docs to distiguish the purpose of
these three files?

Cheers,
Raimund