Multiple PTR records for multiple domains
I'm wondering if BIND works with reverse lookups for Email delivery? we send out emails for a few different sites (abc.com, def.com, 123.com, 456.com), and we are having an issue with one company whose firewall software doesn't accept our emails unless the domain has a reverse lookup of 456.com (but the other domains needs reverse lookup of abc.com, etc).
I know its not recommended to configure a PTR with multiple domains but is there any way to make this work??