-
- # last References should be IRT, but some mail clients do things
- # out of order, so trust IRT over References iff IRT exists
- my @refs = (($hdr->header_raw('References') || '') =~ /<([^>]+)>/g);
- push(@refs, (($hdr->header_raw('In-Reply-To') || '') =~ /<([^>]+)>/g));
-
- if (@refs) {
- my %uniq = ($mid => 1);
- my @orig_refs = @refs;
- @refs = ();
-
- # prevent circular references via References: here:
- foreach my $ref (@orig_refs) {
- if (length($ref) > MAX_MID_SIZE) {
- warn "References: <$ref> too long, ignoring\n";
- }
- next if $uniq{$ref};
- $uniq{$ref} = 1;
- push @refs, $ref;
+ my $refs = references($hdr);
+ return $refs if scalar(@$refs) == 0;
+
+ # prevent circular references via References here:
+ my %mids = map { $_ => 1 } @{mids($hdr)};
+ my @keep;
+ foreach my $ref (@$refs) {
+ # FIXME: this is an archive-prevention vector like X-No-Archive
+ if (length($ref) > MAX_MID_SIZE) {
+ warn "References: <$ref> too long, ignoring\n";