Here is a case where RFC's conflict.
RFC5321 in Section 5 [http://tools.ietf.org/html/rfc5321#section-5] states:
"The lookup first attempts to locate an MX record associated with the name. If a CNAME record is found, the resulting name is processed as if it were the initial name.*"*
To add to the fun, a couple lines further into the paragraph states that:
" If an empty list of MXs is returned, the address is treated as if it was associated with an implicit MX RR, with a preference of 0, pointing to that host."
So technically, every A record must be treated as a capable mail exchanger even if there are no MX records.
We could just axe all the MX records.
On Wed, May 27, 2015 at 3:59 PM, William Lewis kg6baj@n1oes.org wrote:
(Please trim inclusions from previous messages) _______________________________________________ Don't get me wrong. I'm not saying people should ignore the RFC1035 standards. I'm just saying its possible. The one's I'm aware of are all companies using 'In-House' mail systems designed to either keep the mail staying in-house, and/or prevent outside mail from getting in.
But, as pointed out, this group should be following the RFC1035 standard.
Wm Lewis (KG6BAJ) AMPR Net IP Address Coordinator - Northern and Central California Regions (A 100% Volunteer Group) (530) 263-1595 (Home/Office) ______________________________________________
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At 03:48 PM 5/27/2015, you wrote:
(Please trim inclusions from previous messages) _______________________________________________ On Wed, May 27, 2015 at 3:41 PM, William Lewis kg6baj@n1oes.org wrote:
Where you say "Owners, please update them with a proper hostname
instead of
the literal IP address." I would like to point out that it is entirely possible to have an IP address that has no HOSTNAME assigned to it at
all.
The most common are used for mail. I use 2 that are setup this way for security reasons.
MX records must point to a hostname. Here's a good description of why: http://serverfault.com/a/663122
But the bottom line is: it's the spec.
Tom KD7LXL _________________________________________ 44Net mailing list 44Net@hamradio.ucsd.edu http://hamradio.ucsd.edu/mailman/listinfo/44net