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From: Simon White (simon_at_mtds.com)
Date: Mon Dec 02 2002 - 04:14:02 CST

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    30-Nov-02 at 21:52, Scott Blachowicz (Scott.Blachowiczseaslug.org) wrote :
    > I've been looking all over and can't find the answer to this one. I have a
    > CNAME alias (sabami.seaslug.org) with a local user's group that I want to use
    > as my mail server's hostname, so I've got this in my postfix config:

    Use multiple A records. The example below is not a good use of CNAME,
    since they map to aliases with other domain names. DO NOT use CNAME for
    MX records. They must be fully qualified A records in order to not break
    things.

    > to make sure I get all my aliases in the mydestination (is that necessary?). The way
    > things are configured is like this:
    >
    > sabami.seaslug.org CNAME mail.dsab.rresearch.com
    > sab.rresearch.com CNAME mail.dsab.rresearch.com
    > mail.dsab.rresearch.com A 12.235.153.213

    > What I want is for sabami.seaslug.org to be the
    > FQDN that gets used on all email leaving my mail server. But, what seems to be
    > happening is that it gets rewritten (in the envelope sender, To/Reply-to header
    > addresses, at least) to mail.dsab.rresearch.com. I assume there's some logic in
    > there somewhere that is converting CNAME references into the hostname on an A
    > record?? Is there any way to get what I want here?

    Incidentally

    host 12.235.153.213
    213.153.235.12.in-addr.arpa. domain name pointer
    12-235-153-213.client.attbi.com

    So it's a dynamic IP allocation? You aren't going to get reverse DNS to
    agree with you.

    And
    host sabami.seaslug.org
    sabami.seaslug.org. is an alias for mail.dsab.rresearch.com.
    mail.dsab.rresearch.com. has address 12.235.153.213

    This is the problem. The line with the IP address contains a different
    hostname. Make multiple A records. MX records ought to be A records, not
    CNAMEs. 

    -- 
[Simon White. vim/mutt. simonmtds.com. Foldinghome no log script yet...]
Note to experienced users: Please don't encourage anti-support behavior.
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