Date:  Tue, 22 Apr 2008 14:05:13 -0700 (PDT)
From:  mailing list <sunlist (at mark) yahoo.com>
Subject:  [coba-e:12669] Re: Help setting up rdns
To:  coba-e (at mark) bluequartz.org
Message-Id:  <220680.19198.qm (at mark) web63809.mail.re1.yahoo.com>
In-Reply-To:  <797D77D8-353E-4CD1-ACC4-B62EA3633710 (at mark) straszek.dk>
X-Mail-Count: 12669


--- SÓen Siggaard Straszek <gateway (at mark) straszek.dk> wrote:

> I have a lot of mail rejected with a "450 Client host rejected: cannot  
> find your hostname, [xx.xx.xx.xx] " message - i guess this is because  
> i have no rdns.
> 
> I do not use the bluequartz server for dns, the server is in a  
> hostingcenter, and dns i handled from a external dns service.
> 
> Could anyone tell me how to set up rdns? should this be done for all  
> sites on the server or just for the server?, and where to apply the  
> changes  - the server, the hostingcenter or the dns-services?

A quick "nslookup 1.2.3.4" will indicates whether your IP has reverse DNS or
not and if it does what it resolves to.  The majority of hosting companies
completed their reverse DNS with the likes of 1.2.3.4.reverse.com (generic) for
all their IPs.  However, some strict email/spam policy might requires the
reverse DNS resolve to the proper host/IP mail.domain.com = 1.2.3.4 and 1.2.3.4
= mail.domain.com.

If this is the case, simply have your hosting provider edit the reverse DNS and
make the proper changes for your IP to reflect your hostname.domain/etc.

Regards,

Mike



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