Two reverse DNS lookups?

When a consultant set up a firewall and exchange email server for me, they told me to have my ISP set up a reverse DNS lookup for my email server. I am in the process of switching ISPs and reconfiguring the firewall.



Can I have my new ISP set up a new reverse lookup for the new IP address of my email server, while the other still exisits?



In other works can I have two reverse lookups (IP addresses) pointing to the same name (ex. mail.mydomain.com)?Two reverse DNS lookups?
Reverse lookups are done based on IP addresses. The IP address block owner (ISP) will creates the reverse lookup record. So'll you'll have one at the current ISP, and one at the new ISP. Two different IP's, one hostname.



So, yes to answer your question.Two reverse DNS lookups?
You should be able to, this is how multi-domain mail servers are configured.Two reverse DNS lookups?
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http://www.hotmail.com site...

You can get all the details from the site...



Ra