lists.m4, exchange.m4: Check for bogus addresses when doing DNS lookups.
authorMark Wooding <mdw@distorted.org.uk>
Wed, 19 Jul 2017 09:46:08 +0000 (10:46 +0100)
committerMark Wooding <mdw@distorted.org.uk>
Wed, 19 Jul 2017 09:46:08 +0000 (10:46 +0100)
Inspired by Chris Siebenmann's `How not to set up your DNS' series; see
https://utcc.utoronto.ca/~cks/space/blog/__Index.


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