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Background information:<br />
Local domain is internal.example.com<br />
Email server is mailserver.internal.exampl<wbr />e.com<br />
Users have proxy addresses so they send from @example.com<br />
Incoming email is process by an email security device at the ISP that hosts example.com <br />
Outgoing email goes directly from the internal network.<br />
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My question is for the PTR record. &nbsp;Should its name be mailserver.internal.exampl<wbr />e.com or mailserver.example.com ?
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Background information:
Local domain is internal.example.com
Email server is mailserver.internal.example.com
Users have proxy addresses so they send from @example.com
Incoming email is process by an email security device at the ISP that hosts example.com 
Outgoing email goes directly from the internal network.

My question is for the PTR record.  Should its name be mailserver.internal.example.com or mailserver.example.com ?

PTR DNS record question

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.