lib/PublicInbox/WWW.pm | 6 ++++++

diff --git a/lib/PublicInbox/WWW.pm b/lib/PublicInbox/WWW.pm
index 275e509f2f1136ad62d129e114b245f9c8b75cd4..3a428218f783c85849085a1fec549fcaf260adfc 100644
--- a/lib/PublicInbox/WWW.pm
+++ b/lib/PublicInbox/WWW.pm
@@ -141,6 +141,12 @@ # we want to get all immortal allocations done early to avoid heap
 # fragmentation since common allocators favor a large contiguous heap.
 sub preload {
 	my ($self) = @_;
+
+	# populate caches used by Encode internally, since emails
+	# may show up with any encoding.
+	require Encode;
+	Encode::find_encoding($_) for Encode->encodings(':all');
+
 	require PublicInbox::ExtMsg;
 	require PublicInbox::Feed;
 	require PublicInbox::View;