>Either my situation is different, or I'm not understanding.

Your situation is the same -- I was just using the "proper" examples.  If 
you substitute "customer_example.com" for "virtual.example.com" in my 
example, you'll see what I mean.

>My customer, a virtual host on my Imail server, is customerexample.com, with
>an MX of mail.customerexample.com and no reverse DNS.

It *does* have a reverse DNS.

The reverse DNS entry takes an IP address and returns a host name.  In this 
case, both the main domain and the virtual domain will use the same IP 
address, so they will both have a reverse DNS entry.

>I can't solve the reverse DNS issue for mail.customerexample.com.  I guess I
>have to change the MX to mail.example.com, my server.  Is this correct?

No.

Just so long as mail.customer_example.com's MX record points to a host that 
has an IP address with a reverse DNS entry there is no problem.  For example:

         customer_example.com.  MX  10  mail.customer_example.com
         mail.customer_example.com A 192.168.100.12

Just so long as 192.168.100.12 has a reverse DNS entry, there will be no 
problem.
                             -Scott

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