I have a new client running exchange 2013, with one IP address
so far it has been set up to send and receive emails for over 70 domains and is still increasing
his office has about 100 users in it some send/receive only for 1 domain while others are on multiple domains a few are on all domains.
1. is there a maximum amount of domains that can be added
2. is this really a sensible idea to do it this way or can anyone suggest a better way
3. can I create PTR records for reverse DNS for all domains