[Bug 225664] mail/postfix: add blacklistd(8) support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225664

            Bug ID: 225664
           Summary: mail/postfix: add blacklistd(8) support
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ohauer at FreeBSD.org
          Reporter: meta+ports at vmeta.jp
          Assignee: ohauer at FreeBSD.org
             Flags: maintainer-feedback?(ohauer at FreeBSD.org)

Created attachment 190316
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=190316&action=edit
patch

Hi, 

NetBSD has introduced blacklistd support to postfix.
https://github.com/NetBSD/src/commit/3ae4028

I've imported it to mail/postfix.

The purpose to support blacklistd in postfix is to block SMTP-AUTH brute-force
attack on 587/tcp or 465/tcp. This patch inserts notification of SASL 
authentication failure.

Probably some more changes will be needed before merge but let's discuss.

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