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-rw-r--r--lib/PublicInbox/LeiConvert.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/LeiConvert.pm b/lib/PublicInbox/LeiConvert.pm
index 17a952f2..4d4fceb2 100644
--- a/lib/PublicInbox/LeiConvert.pm
+++ b/lib/PublicInbox/LeiConvert.pm
@@ -52,6 +52,7 @@ sub lei_convert { # the main "lei convert" method
         my ($lei, @inputs) = @_;
         $lei->{opt}->{kw} //= 1;
         $lei->{opt}->{dedupe} //= 'none';
+        $lei->{input_opt}->{sort} = 1; # for LeiToMail conflict check
         my $self = bless {}, __PACKAGE__;
         my $ovv = PublicInbox::LeiOverview->new($lei, 'out-format');
         $lei->{l2m} or return