[CentOS] Re: DKIM

Les Mikesell lesmikesell at gmail.com
Thu Sep 25 18:17:53 UTC 2008


Ralph Angenendt wrote:
> 
>> Your problem - if you actually want to solve it instead of tossing the
>> blame to others like yahoo is...
>>
>> # host mail.creativeprogramdesigners.com
>> mail.creativeprogramdesigners.com has address 72.35.68.58
>>
>> # host 72.35.68.58
>> 58.68.35.72.in-addr.arpa domain name pointer
>> creativeprogramdesigners.com.
>>
>> the forward doesn't match the reverse - it's that simple. Why not just
>> fix it?
> 
> Because it is *NOT* needed. I have several machines which have lots of
> A records for just one ip address. But only one name when I do a reverse
> lookup. Anyone checking for that shouldn't be allowed to receive mail. 

Mail isn't supposed to be rejected for this, but some places probably 
do.  A more correct approach is to have one name with the A record and 
the matching ptr and make all of the other names CNAMEs.

-- 
   Les Mikesell
     lesmikesell at gmail.com



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