From 7ac3b383237abd1eef6981e4d8cedaec4b7c8ad7 Mon Sep 17 00:00:00 2001
From: "Dirk-Jan C. Binnema" <djcb@djcbsoftware.nl>
Date: Sat, 25 Oct 2025 16:55:02 +0300
Subject: message: ensure message text is valid utf8

Seems this is not guaranteed, so convert if needed.
---
 lib/message/mu-message.cc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/message/mu-message.cc b/lib/message/mu-message.cc
index 2d7c17f..4659eb8 100644
--- a/lib/message/mu-message.cc
+++ b/lib/message/mu-message.cc
@@ -374,10 +374,15 @@ get_mailing_list(const MimeMessage& mime_msg)
 static void
 append_text(Option<std::string>& str, Option<std::string>&& app)
 {
+	/*
+	 * it is not guaranteed that what we get here is valid utf8,
+	 * so we enforce it with utf8_clean
+	 */
+
 	if (!str && app)
-		str = std::move(*app);
+		str = utf8_clean(std::move(*app));
 	else if (str && app)
-		str.value() += app.value();
+		str.value() += utf8_clean(app.value());
 }
 
 static void
-- 
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