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-rw-r--r--lib/PublicInbox/LeiToMail.pm4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm
index 49b5c8ab..9d9b5748 100644
--- a/lib/PublicInbox/LeiToMail.pm
+++ b/lib/PublicInbox/LeiToMail.pm
@@ -343,8 +343,8 @@ sub new {
                                 "$dst exists and is not a directory\n";
                 $lei->{ovv}->{dst} = $dst .= '/' if substr($dst, -1) ne '/';
         } elsif (substr($fmt, 0, 4) eq 'mbox') {
-                -e $dst && !-f _ && !-p _ and die
-                                "$dst exists and is not a regular file\n";
+                (-d $dst || (-e _ && !-w _)) and die
+                        "$dst exists and is not a writable file\n";
                 $self->can("eml2$fmt") or die "bad mbox --format=$fmt\n";
                 $self->{base_type} = 'mbox';
         } else {