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-rw-r--r--lib/PublicInbox/LeiToMail.pm4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm
index 744f331d..0e23b8da 100644
--- a/lib/PublicInbox/LeiToMail.pm
+++ b/lib/PublicInbox/LeiToMail.pm
@@ -418,4 +418,8 @@ sub post_augment { # fast (spawn compressor or mkdir), runs in main daemon
         $self->$m($lei);
 }
 
+sub lock_free {
+        $_[0]->{base_type} =~ /\A(?:maildir|mh|imap|jmap)\z/ ? 1 : 0;
+}
+
 1;