uofa.edu
(subdomain name) $m = uofa.edu
(node name) $k = here
========================================================
Look for a statement that indicates whether your sendmail was compiled with NAMED_
BIND support (?§3.4.27 on page 124). If it was, it can use DNS. If it wasn??™t, either you
will have to get a corrected version from your vendor, or you will have to download
and compile the latest version of sendmail from scratch (?§2.2 on page 42).
But even if your sendmail binary supports DNS, site configuration might not. If your
host supports a service-switch file, for instance, make sure that file lists dns as the
method used to fetch information about hosts.
If your sendmail still seems unable to use DNS, despite your efforts, look for other
reasons for failure. Make sure, for example, that your /etc/resolv.conf file is present
and that it contains the address (not the name) of a valid name-server machine for
your domain.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
9.2 How sendmail Uses DNS | 325
9.2 How sendmail Uses DNS
The sendmail program uses DNS in several different ways:
??? When sendmail first starts, it might use DNS to get the canonical name for the
local host. That name is then assigned to the $j macro (?§21.9.59 on page 830).*
If DNS returns additional names for the local host, those names are assigned to
the class $=w (?§22.
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