network/postfix: Initial import

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+What is Postfix? It is Wietse Venema's mailer that started life as an
+alternative to the widely-used Sendmail program.
+
+Postfix attempts to be fast, easy to administer, and secure, while at
+the same time, being sendmail compatible enough to not upset existing
+users. Thus, the outside has a sendmail-ish flavor, but the inside is
+completely different. 
+
+This script builds postfix with support for Dovecot SASL but does not
+include any support for Cyrus-SASL. If you need to enable support for
+Cyrus see SASL_README in the source code. You can also enable support
+for MySQL and Postgres. This script should find support for BerkleyDB
+and PCRE automagically, so no special options are required.  Further,
+this script builds postfix with TLS support and requires that openssl
+be installed. openssl-solibs is not enough. You can find a SlackBuild
+script for Dovecot at http://www.slackbuilds.org/ but you do not need
+to install it to use this package without SASL.
+
+A couple things to remember about postfix:
+    - this script doesn't add the necessary postfix user and postdrop
+      group, but exits if they do not exist. Add these before running
+      this script. They should have no special permission and postfix
+      should NOT be a member of the postdrop group. The script *WILL*
+      offer some sane defaults that won't conflict with the canonical
+      users and groups, and shouldn't conflict with any other scripts
+      downloaded from slackbuilds.org that require their own uids and
+      gids
+    - many of the utilities in postfix have multiple manpages such as
+      postconf(5) and postconf(8).  Use man -k to find them.
+    - subscribe to the postfix-users mailing list
+
+If you are upgrading a previous release of postfix, be sure to update
+all references to earlier versions main.cf.
+
+If you have any questions or comments about this script, you are free
+to contact me via e-mail at <alan@lizella.net>.  Thanks!
+