Re: name service error

Subject: Re: name service error
From: Andrew McNamara (andrewmconnect.com.au)
Date: Wed Jan 26 2000 - 06:49:10 CST

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>Thanks to both respondents for replies. Turns out the name given in
>the relay host entry of main.cf is a CNAME and not an A record entry
>in DNS. For some reason mailers frown on this. Even changing the CNAME
>to A didn't help (reverse DNS checked?) - I had to use the bona fide A
>NAME record in the host.
>
>I don't know what changed on our network when. Problem is worked
>around. My only request to the postfix author would be to make the DNS
>error message a little more explicit - if CNAME or reverse are being
>checked, report those errors as such - much easier to track than the
>general message, "Name service error".

I think surounding the relayhost name with square brackets disables the
normal behaviour of looking up MX records for the host in question and
forces it to treat it as a regular host name (which would accept a
CNAME)

I.e.,

relayhost = [smtp.internal]

 ---
Andrew McNamara (System Architect)

connect.com.au Pty Ltd
Lvl 3, 213 Miller St, North Sydney, NSW 2060, Australia
Phone: +61 2 9409 2117, Fax: +61 2 9409 2111

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