[CentOS] DKIM

Andrew Norris andrewn at locus.net
Wed Sep 24 21:33:32 UTC 2008


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?

-- 
Andrew Norris
Systems Administrator
Locus Telecommunications
andrewn at locus.net
(201)-947-2807 ext. 1135


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