On Thu, Jul 7, 2011 at 7:41 PM, kashani <kashani-list@...> wrote:
> If you aren't using Sieve, I would try is using virtual_transport = virtual
> instead of virtual_transport = dovecot

Thanks! That seems to have worked. Mail is still being delivered, and
now the X-Original-To: header is in-place. Really great, now I can
start migrating my mail domains that depend on that feature.

I also found a semi-work-around posted by Wietse Venema on the postfix list:

[quote]
You can fake it in the SMTP server with

/etc/postfix/main.cf:
smtpd_recipient_restrictions =
check_recipient_access pcre:/etc/postfix/recipient_access.pcre

/etc/postfix/recipient_access.pcre
/(.+)/ prepend X-Original-To: $1
[end quote]

This method worked with virtual_transport = dovecot, however it had
problems dealing with multi-recipient mail. (for example if
user1@... and user2@... were both recipients on the
same message, both users' mail would have the first username as the
X-Original-To header). That situation is rare enough in my case that
it would have been acceptable if the virtual_transport = virtual
wasn't usable.

Thanks again,
Paul