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-rw-r--r--atom.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/atom.c b/atom.c
index 2851e3c..bf4b456 100644
--- a/atom.c
+++ b/atom.c
@@ -27,7 +27,7 @@ static char *atomID(const char *messageID) {
 		{ "messageID", messageID },
 		{0},
 	};
-	return templateURL("mailto:?In-Reply-To=[messageID]", vars);
+	return templateURL("mailto:?Message-Id=[messageID]", vars);
 }
 
 int atomEntryHead(FILE *file, const struct Envelope *envelope) {