Reverse Dns Question...is it really necessary or not?

[Barry Margolin]

In article <cd4266$co9$1 at sf1.isc.org>, Chip Mefford <cpm at well.com> 
wrote:

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> Jonathan de Boyne Pollard wrote:
> | KD> some misguided mail servers/admins use reverse lookups as a
> | KD> kind of litmus test for spam (as if spammers couldn't come
> | KD> up with their own reverse records, duh).
> 
> Right, but spambots don't.

Why not?  Don't most residential ISPs implement reverse DNS for the 
addresses they assign to their customers?  They're usually just 
arbitrary names like nyc-123.dialup.isp.net, but they're still there.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***