David Kazan wrote:
> What are the options for setting up reverse DNS (PTR records) for
> virtual domains, all on a single IP? As I understand it, we can
> only have one PTR record per IP. In that case, how will the other
> domains be verified by anti-spam filtering which makes use of PTR
> records?
To the best of my knowledge the filtering only goes down to the third
level of the domain name, (i.e. company.com. or school.edu.) so if
the SMTP request come in as here.there.school.edu. with an IP address
of 2.4.6.8 as long as the PTR record returns something.school.edu. it
should be OK.
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