[Mimedefang] Can MD/SA combo detect no reverse ip?

Kenneth Porter shiva at sewingwitch.com
Thu Jun 12 14:43:01 EDT 2003


--On Thursday, June 12, 2003 9:10 AM -0400 Joseph Brennan
<brennan at columbia.edu> wrote:

> Remember the RFCs do not require
> rDNS for mail hosts.

On the dnsop list, there's some indication that IPv6 will make little effort
to maintain rDNS at all.

Perhaps a better test is to check the reply address for either an MX or A
record (ie. is there any hope of being able to reply to it?). One should use
the same header that an MUA would use to reply.





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