-----Original Message-----
From: Miles Fidelman
The original poster's question caught my attention - the RFCs suggest that
there should be only one PTR record per IP address -- which begs the
question of what do when one is serving multiple domains behind that
You set up the other domains so that the DNS has the "main" name as MX and
the server sends mail even for the other domains using the server real name.
In addition, setting up things like SPF and DKIM records for all the domains
and making the "main" MX the authorised sender for them helps with
validation.
-Reko
