spam checks: PTR records, dynamic domain

[Myrle A Francis 2nd]

"What identifies your domain as being dynamic? That it is served by DNS
servers belonging to a dynamic DNS service? The TTL setting?"

 Tom you may not be too far off in your thinking. I know a sys admin
that automatically flags .biz addresses as spam ...

Tom Metro wrote:
> Bill Horne wrote:
> 
>> Since I use a dynamic dns service to receive email on my Debian box,
>> I'll ask what happens when forward (A) and reverse (PTR) records don't
>> match.
> 
> 
> I believe typical practice these days, if PTR records are examined at
> all, is to just check that they exist, not that the returned domain
> matches the domain specified in the SMTP HELO. But I don't know what
> DynDNS specifically implements.
> 
> 
>> I don't know why, but some System Administrators
>> think that a "dynamic" domain name is prima facie proof of spam.
> 
> 
> What identifies your domain as being dynamic? That it is served by DNS
> servers belonging to a dynamic DNS service? The TTL setting?
> 
>  -Tom
> 

-- 
Myrle A. Francis 2nd

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Type bits /keyID    Date       User ID
pub  1024D/30BDB814 2006/07/27 Myrle A. Francis 2nd <mafmanet at gmail.com>
     Key fingerprint = 73E3 6EAF EC29 29A3 94F9  6C78 F427 0FE8 30BD B814




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