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- ###########################################################################
- # [Disable Reverse DNS]
- #
- # Description: "Set if reverse DNS lookups are performed on incoming mail"
- # Keywords: "DNS, domain name server, TCP/IP, reverse lookups"
- # Category: "Basic configuration"
- # Format: "{TRUE OR FALSE}"
- #
- # Sets whether or not MailShield performs a reverse DNS lookup when a TCP/IP
- # connection is made to MailShield.
- #
- # Explanation: to send mail to a host on the Internet, a mail server makes
- # a TCP/IP connection to another mail server. When you use MailShield, then
- # MailShield is your mail server. MailShield can look up the TCP/IP address
- # of the other mail server, and determine the hostname and domain of the
- # connecting machine. This is called a "reverse lookup" because a name is
- # determines from the TCP/IP address, as opposed to a "forward lookup",
- # which is where a TCP/IP address is determined from a hostname.
- #
- # MailShield uses this reverse DNS lookup information in several places:
- # 1) in the Received: header it inserts, 2) for okrelayd.txt, i.e.: domains
- # approved for relaying feature, 3) in the bandom.txt file, i.e.: banned
- # domains, 4) in the noname.txt file, i.e.: connecting host has no name
- # and 5) in the tarpitd.txt file, i.e.: hostnames to tarpit.
- #
- # However, if you are not using any of these features, you may want to
- # not have MailShield perform the reverse DNS lookup, as it does take
- # a little bit of time for the reverse lookup to be performed.
- #
- # Note that MailShield maintains its own in-memory DNS cache for both
- # forward and reverse DNS lookups, and is thus more efficient than most
- # mail servers in performing reverse DNS lookups over the long term.
- #
- # By default, reverse DNS lookups not disabled. If you want to disable
- # reverse DNS lookups, be sure that you are not using any of the features
- # listed above.
- #
- # To disable reverse DNS lookups, set this value to TRUE.
- #
- # Instructions: "Please enter the word TRUE or the word FALSE below."
- FALSE
-