https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7339

            Bug ID: 7339
           Summary: Use of uninitialized value $2 in concatenation (.) or
                    string
           Product: Spamassassin
           Version: 3.4.1
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: spamassassin
          Assignee: [email protected]
          Reporter: [email protected]

on recent operating systems the "a domain name contains a null label" shows a
much bigger problem than only the dns warnings and tends to flood the maillog

* OS: Fedora 24 x86_64
* perl-5.22.2-362.fc24.x86_64
* perl-Net-DNS-1.06-2.fc24.noarch

Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $4 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $3 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $2 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: dns: new_dns_packet
(domain=...(.sbl.spamhaus.org. type=A class=IN) failed: a domain name contains
a null label
Aug  5 12:12:39 mail-gw spamd[15922]: dns: new_dns_packet
(domain=...(.zen.spamhaus.org. type=A class=IN) failed: a domain name contains
a null label
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $4 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $3 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $2 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $4 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $3 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $2 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $4 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $3 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $2 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $4 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $3 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $2 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $4 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $3 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.
Aug  5 12:12:39 mail-gw spamd[15922]: Use of uninitialized value $2 in
concatenation (.) or string at
/usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/URIDNSBL.pm line 1042,
<GEN105> line 263.

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