1 files changed, 37 insertions, 0 deletions
diff --git a/perllib/Utils/Email.pm b/perllib/Utils/Email.pm
new file mode 100644
index 000000000..a30e41c61
--- /dev/null
+++ b/perllib/Utils/Email.pm
@@ -0,0 +1,37 @@
+package Utils::Email;
+
+use Email::Address;
+use Net::DNS::Resolver;
+
+# DMARC stabbity stab
+sub test_dmarc {
+    my $email = shift;
+
+    my $addr = (Email::Address->parse($email))[0];
+    return unless $addr;
+
+    my $domain = $addr->host;
+    my @answers = _send(Net::DNS::Resolver->new, "_dmarc.$domain", 'TXT');
+    @answers = map { $_->txtdata } @answers;
+    my $dmarc = join(' ', @answers);
+    return unless $dmarc =~ /p *= *reject/;
+
+    return 1;
+}
+
+# Same as send->answer, but follows one CNAME and returns only matching results
+sub _send {
+    my ($resolver, $domain, $type) = @_;
+    my $packet = $resolver->send($domain, $type);
+    my @answers;
+    foreach my $rr ($packet->answer) {
+        if ($rr->type eq 'CNAME') {
+            push @answers, $resolver->send($rr->cname, $type)->answer;
+        } else {
+            push @answers, $rr;
+        }
+    }
+    return grep { $_->type eq $type } @answers;
+}
+
+1;