[CentOS] DKIM

John Hinton webmaster at ew3d.com
Wed Sep 24 21:58:04 UTC 2008


Andrew Norris wrote:
> John Kordash wrote:
>>> mail.bobhoffman.com != bobhoffman.com
>>
>> Careful here.  Email senders have nothing to do with MX records.  
>> Email receivers do.
>>
>> I believe bobhoffman.com is the email sender in this case.
>>
>> I would doubt this is an issue.  Any split in/out mail server is 
>> going to have a different host for receipt (MX) than send.
>>
>> -John
>
> You're right, I was making an assumption I shouldn't have.  Namely 
> that there was a single host/ip for both sending and receiving email.  
> Going back to the logs he posted I'd say that assumption was correct 
> in the end.
>
> From the yahoo headers:
> "Received:   from 72.35.68.59 (EHLO mail.bobhoffman.com)"
>
> So his MTA is EHLOing as mail.bobhoffman.com
> mail.bobhoffman.com resolves to 72.35.68.59 (matches the incoming ip)
> 72.35.68.59 reverses to bobhoffman.com (which doesn't match the host)
>
> As far as I can tell this will hurt his score.
> Or am I missing something?
>
If that were the case, every domain would need a unique IP address and 
we'd be long out of numbers.

John Hinton


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