[rt-users] what is the best way of changing FQDN while keeping the old?

[Stuart Browne]

> -----Original Message-----
> From: slamp slamp
> Sent: Tuesday, 11 May 2010 04:19
> 
> For example:
> 
> From rt.domA.com to rt.domB.com.
> 
> From support at domA.com to support at domB.com
> 
> During the transition, we would still like to support rt.domA.com via
> a redirecto rt.domB.com (apache). And e-mail to support at domA.com go to
> support at domB.com (sendmail).
> 
> Has anyone done this before?

This is what the 'virtusertable' in Sendmail is for.  You can map an entire domain to another entire domain:

>From /usr/share/sendmail-cf/README (RHEL box, sendmail-cf package):

The username from the original address is passed as %1 allowing:

        @foo.org        %1 at example.com