Restrict sender and from to one domain on outbound smtp

6 msg	DSN relay host

Restrict sender and from to one domain on outbo...
\ D G Teed (7 May 2008)

10 msg	Outbound postfix routing issue
25 msg	Problem with Black List
3 msg	Looking at new mail server layout
26 msg	why every minute: 'reload configuration /etc/po...
2 msg	myhostname parameter
17 msg	RBL problems with smarthost on private address ...
34 msg	Backscatting filter?
3 msg	how to setup postfix in 'deliver-only' mode?
7 msg	Slow queue configuration
17 msg	Some Windows SMTP Server have problems with STA...
5 msg	For each check_ns or each check_mx, the value i...
4 msg	postfix and spf
2 msg	Password Validation in postfix
4 msg	catching some spam with warn_if_reject and reje...
9 msg	RFC: Check mail quota at a mail relay (backscat...
31 msg	GPS vs GLD (greylisting)
3 msg	Unmeant update from 2.2.10 to 2.5.1
27 msg	mailq lockups

Subject:	Restrict sender and from to one domain on outbound smtp
Group:	Postfix-users
From:	D G Teed
Date:	7 May 2008

I'm having a little trouble finding the option I need in postfix.

I have a little smtp service for outbound which will only serve
a web mail service. I want to enforce that the from, reply-to
and sender in the envelope are all from @mydomain.com
and reject if from some other domain.

What is the best path for this? header_checks perhaps?

--Donald