[CentOS] Re: DKIM
John R Pierce
pierce at hogranch.com
Thu Sep 25 18:26:34 UTC 2008
Les Mikesell wrote:
> 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.
no, no, no! CNAMES are discouraged as they create additional work
for everyone else's DNS servers. the only time its proper to use a
CNAME is when you are referencing a host on someone else's network who's
addressing and management is beyond your control and you won't get
notifications if its changing.
for email, all the various domains should have MX records with the mail
server's "true" name.
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