Re: [Exim] MX processing (1)

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著者: Dean Brooks
日付:  
To: exim-users
題目: Re: [Exim] MX processing (1)
> One thing that CNAMES does allow is for grouping/seperation..
>
> dom1.org    in MX    10 bazmail.mydomain.com.
> dom2.org    in MX    10 bazmail.mydomain.com.
> dom3.org    in MX    10 bazmail.mydomain.com.
> dom4.org    in MX    10 bazmail.mydomain.com.
> dom5.org    in MX    10 bazmail.mydomain.com.

>
> barmail.mydomain.com    in CNAME realname.mydomain.com.
> foomail.mydomain.com    in CNAME realname.mydomain.com.
> bazmail.mydomain.com    in CNAME realname.mydomain.com.


Of course, the problem still remains that many many mail servers
out on the Internet will choke or "do the wrong thing" if they
encounter CNAME references in an MX record.

While the above solution (whether implement as shown or in zone file
macros) may be elegant, it will eventually cause you nightmares when
one of your users/customers complains of {un|mis}delivered mail.

Not to mention the absolute horrors of what happens when people
reference CNAMEs in NS records. That's definitely not a pretty sight.

Regards, Dean

--
Dean A. Brooks                         Email: dean@???
IgLou Internet Services, Inc.          Voice: (502) 966-3848
Louisville, KY / USA                          (800) 436-4456