learn: support multiple To/Cc headers

It's possible to specify these headers multiple times, and
PublicInbox::MDA->precheck takes that into account, so
-learn should, too.

1 files changed, 5 insertions, 3 deletions

diff --git a/script/public-inbox-learn b/script/public-inbox-learn
index c4c4d4b9..8ff1652b 100755
--- a/script/public-inbox-learn
+++ b/script/public-inbox-learn
@@ -42,9 +42,11 @@ my $mime = PublicInbox::MIME->new(eval {
 # get all recipients
 my %dests;
 foreach my $h (qw(Cc To)) {
-        my $val = $mime->header($h) or next;
-        foreach my $email (PublicInbox::Address::emails($val)) {
-                $dests{lc($email)} = 1;
+        my @val = $mime->header($h) or next;
+        for (@val) {
+                foreach my $email (PublicInbox::Address::emails($_)) {
+                        $dests{lc($email)} = 1;
+                }
         }
 }