Public bug reported:

Binary package hint: libmail-spf-query-perl

Not all DNS servers support the new SPF RR type and reply unsupported or
SERVFAIL to queries for it.  libmail-spf-query-perl will cause mail to
be 451 rejected in postfix-policyd-spf-perl.

Noted here that some email servers will incorrectly reject mail if
unsupported:

http://www.simpledns.com/newsitem.aspx?id=2171

Example rejection:

Nov  9 15:24:29 hyolee postfix/policy-spf[15752]: : Policy
action=DEFER_IF_PERMIT SPF-Result=smtp03.hkpc.org: 'SERVFAIL' error on
DNS 'SPF' lookup of 'smtp03.hkpc.org'

A possible workaround is editing /usr/share/perl5/Mail/SPF/Server.pm,
line 440 to treat unsupported operation as not found:

    $packet->header->rcode =~ /^(NOERROR|NXDOMAIN|SERVFAIL)$/

** Affects: libmail-spf-query-perl (Ubuntu)
     Importance: Undecided
         Status: New

-- 
SPF rejects mail on unsupported SPF RR type
https://bugs.launchpad.net/bugs/161133
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