How do you setup for multiple domains, so that Reverse DNS requests work?

We have a hosted exchange system with multiple domains.  The domains mx records points to our site.  We have a few clients that have email being refused because the Reverse DNS is not correct, it is showing ourselves instead of the hosted domain.  How can we setup our environment so that the Reverse DNS requests are valid?  We have asked for the receiver to Whitelist us but have not had any luck.  Any information would be helpful.  Thanks in advance.
SafetyNet-TCAsked:
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
You don't need to worry about setting it for multiple domains - that is not important - what is important is that the FQDN you use on your SMTP Connector / SEND Connector resolves back to the IP Address that you are sending from and that the FQDN for Reverse DNS on the Fixed IP Address also resolves back to the Fixed IP Address.  Multiple domains make no difference.
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