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diff --git a/roles/mail/files/sieve/after.d/51-msgid.sieve b/roles/mail/files/sieve/after.d/51-msgid.sieve
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+++ b/roles/mail/files/sieve/after.d/51-msgid.sieve
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+#
+# /usr/local/etc/dovecot/sieve/after.d/51-msgid.sieve
+#
+# Global filters to filter messages with invalid "message-id".
+#
+# Aaron LI
+# 2017-04-24
+#
+
+ 
+require "fileinto";
+require "mailbox";
+require "imap4flags";
+require "regex";
+
+
+# Trash messages with improperly formed "message-id"
+if not header :regex "message-id" ".*@.*\\." {
+    fileinto :create "Trash";
+    setflag "\\Seen";
+    stop;
+}