lib/PublicInbox/Eml.pm | 2 +-

diff --git a/lib/PublicInbox/Eml.pm b/lib/PublicInbox/Eml.pm
index 462d51fc0cbcd118770abc2ba8bbe0af9fea1008..bd27f19b0eba0322729fea031d55577b0f1b0dd4 100644
--- a/lib/PublicInbox/Eml.pm
+++ b/lib/PublicInbox/Eml.pm
@@ -217,7 +217,7 @@ 		# buggy versions of git-send-email, otherwise drop it
 		# There's also a case where quoted text showed up in the
 		# preamble
 		# <20060515162817.65F0F1BBAE@citi.umich.edu>
-		unshift(@parts, new_sub(undef, \$pre)) if $pre =~ /:/s;
+		unshift(@parts, new_sub(undef, \$pre)) if index($pre, ':') >= 0;
 		return \@parts;
 	}
 	# "multipart", but no boundary found, treat as single part