YOURLS/antispam — pull request #3 by tmzullinger (2014-03-03 21:05:03+00:00)
Title: Ensure the blacklist lookup uses a fully qualified domain name

Without the trailing '.' the lookup might have a local domain appended
per /etc/resolv.conf on a poxsix system, for example. This can cause
spurious failures.

I ran into this in an environment where we have a wildcard MX record
in place. The result was that dns_get_record() returned a result for
.. and subsequently treated every URL as
blacklisted. ;)