diff --git a/lsp-ltex-plus.el b/lsp-ltex-plus.el
index ff7d8d0..ef6a37a 100644
--- a/lsp-ltex-plus.el
+++ b/lsp-ltex-plus.el
@@ -54,7 +54,8 @@ https://github.com/ltex-plus/ltex-ls-plus"
      latex-mode LaTeX-mode  ; AUCTeX 14+ has renamed latex-mode to LaTeX-mode
      markdown-mode gfm-mode
      org-mode
-     rst-mode)
+     rst-mode
+     message-mode mu4e-compose-mode)
   "List of major mode that work with LTEX+ Language Server."
   :type '(list symbol)
   :group 'lsp-ltex-plus)