[Dovecot] Lost %d variable

[Timo Sirainen]

On Mon, 2010-09-13 at 12:51 -0400, Aladdin wrote:

> command = /usr/lib/dovecot/deliver
> 
> which according to the wiki should work.  

Yeah.. It's for system user setups, which means there are no domains.

> command = /usr/lib/dovecot/deliver -d $local_part@$domain  -f
> $sender_address -a $original_local_part@$original_domain
> 
> This raises several questions, so, in the interest of fooling myself into
> believing I understand this, I'm going to ask them:
> 
> 1. As printed in the wiki and quoted by Stephan, the documentation says, "-d
> <username>: Destination username. If given, the user information is looked
> up from dovecot-auth. Typically used with virtual users, but not necessarily
> with system users."  So, why did I have to use it here?

Because Postfix doesn't add @domain to USER environment.

> 2. Why do the -f and -a switches have to be given?  Aren't those things
> unchanged in the mail header?

If -a isn't given, it's taken from Envelope-To: header. I don't know if
Postfix adds this header.

If -f isn't given, it's taken from Return-Path: header. Postfix adds
this header, so this shouldn't be necessary.

Of course, it's possible that the actual original addresses differ from
what is written to headers (like +ext part could be dropped).