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-rw-r--r--Makefile.PL1
1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile.PL b/Makefile.PL
index 7dac4924..3e4f64d3 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -17,6 +17,7 @@ WriteMakefile(
                 'Email::MIME::ContentType' => 0,
                 'Email::Filter' => 0,
                 'Email::Address' => 0,
+                'Mail::Thread' => '2.5', # 2.5+ needed for Email::Simple compat
                 'Date::Parse' => 0,
                 'Encode::MIME::Header' => 0,
                 'XML::Atom::SimpleFeed' => 0,