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Re: "Name service error for name=localhost type=A" Error

From: Wietse Venema (wietseporcupine.org)
Date: Fri Feb 13 2004 - 13:58:59 CST

Ryan Knopp:
> >>>>>>>><ryantheknopps.com <mailto:ryantheknopps.com>>: Name service
> >>error for name=localhost type=A: Host not found
>
> >>What is this? Is this a reply from the Postfix SMTP server while
> >>Postfix RECEIVES mail? Is this in an email message that Postfix
> >>returns to the sender when it is unable to DELIVER mail?
>
> This is what the sender gets sent back and this is also what gets sent
> to the rootlocalhost account. It comes from
> Mail Delivery System <MAILER-DAEMONtheknopps.com>

And now you have to find out why Postfix attempts to send
this mail to localhost (is there a content filter?).

If that is really what you want, then either configure a DNS zone
that answers to queries for "localhost", for example:

/etc/namedb/named.conf:
    zone "localhost" in {
            type master;
            file "localhost";
    };

/etc/namedb/localhost:
     IN SOA spike.porcupine.org. wietse.spike.porcupine.org. (
                                    1996120101 ; Serial
                                    3600 ; Refresh
                                    300 ; Retry
                                    3600000 ; Expire
                                    3600 ) ; Minimum
            IN NS spike.porcupine.org.
            IN A 127.0.0.1

or else you configure Postfix to look in /etc/hosts:

/etc/postfix/main.cf:
    smtp_host_lookup = dns, native

This forces lookups via gethostbyname().

        Wietse