From 01c07d8bcc517fde321352f0fd14df887f50eedb Mon Sep 17 00:00:00 2001
From: libanp <liban.parker@gmail.com>
Date: Mon, 8 Jun 2026 23:26:18 +0100
Subject: [PATCH] Fix mu tag parsing from Keywords header

Split tags in the Keywords field on commas instead of spaces

https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.5

Fixes #2932
---
 lib/message/mu-message.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/message/mu-message.cc b/lib/message/mu-message.cc
index ebe3f812..a0912633 100644
--- a/lib/message/mu-message.cc
+++ b/lib/message/mu-message.cc
@@ -317,7 +317,7 @@ static std::vector<std::string>
 extract_tags(const MimeMessage& mime_msg)
 {
 	constexpr std::array<std::pair<const char*, char>, 3> tag_headers = {{
-		{"X-Label", ' '}, {"X-Keywords", ','}, {"Keywords", ' '}
+		{"X-Label", ' '}, {"X-Keywords", ','}, {"Keywords", ','}
 	}};
 
 	std::vector<std::string> tags;