rDNS files
Some of the options described below search files for rDNS names. In all those
cases, the format of the files is the same. Blank lines and lines beginning
with #
are ignored. Every other line in the file is expected to contain a
single entry.
Individual names may be given as separate entries. Those names will be matched literally. For example:
mail.example.com
smtp.example.com
mail.example.com
and
smtp.example.com
.
The rDNS names may also use wildcards by beginning with dots (.
). For example,
if the file contained the following entry:
.example.com
example.com, mail.example.com
and mail.internal.example.com
will
match. If the file contained the following entry:
.mail.example.com
The names mail.example.com
and internal.mail.example.com
will match but
example.com
and internal.example.com
will NOT.