block emails with no valid reverse DNS

[Vasantha Narayanan]

Hi,

I want to block emails from servers which do not have a valid reverse DNS
lookup.  I would like to be able to do this without using a DNSBL server,
but merely using dns.   Can you tell me:
1. How this can be done using Sendmail?
2.  How can this be done using MailScanner?

Thanks.

Vasantha

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