1 files changed, 10 insertions, 0 deletions
diff --git a/rules/headers_checks.lua b/rules/headers_checks.lua
index 0a7a3c16e..a97d7483f 100644
--- a/rules/headers_checks.lua
+++ b/rules/headers_checks.lua
@@ -1033,3 +1033,13 @@ rspamd_config.INVALID_RCPT_8BIT = {
   score = 6.0,
   group = 'headers'
 }
+
+rspamd_config.XM_CASE = {
+  callback = function (task)
+    local xm = task:get_header('X-mailer', true)
+    if (xm) then return true end
+  end,
+  description = 'X-mailer .vs. X-Mailer',
+  score = 0.5,
+  group = 'headers',
+}