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My IP address is shared between my webserver and mail server:

www.example.com A 123.123.123.123
mail.example.com A 123.123.123.123

Setting up a PTR record for mail affected both of my mail and web servers.

I do NOT want my webservers to respond to PTR lookup. What are my options (other then adding additional IPs)

Thanks.

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Your webserver does not respond to a PTR lookup, your DNS server does.

A ptr lookup is just a "question" for the DNS server, where you have (and send him) the IP, and want the domain name for that IP. There is no way to distingusih weather it's for a web service or a mail service.

Your only choice here is to use another different IPs.

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