spam.m4: Apply Exim's header validation to incoming messages.

diff --git a/spam.m4 b/spam.m4
index 705fbeed116fe69af437c9640a19181717635503..d1b7c50206c8e7b753f22ad8da1fa01e50a25f55 100644 (file)
--- a/spam.m4
+++ b/spam.m4
@@ -116,6 +116,9 @@ data_spam:
        ## If the client is trusted, don't bother with any of this.
        accept   hosts = +trusted
 
+       ## Check header validity.
+       require  verify = header_syntax
+
        ## Check the message for spam, comparing to the configured limit.
        deny     spam = exim:true
                 message = Tinned meat product detected ($spam_score)