error on encounter of an unknown header slot

diff --git a/mailplate b/mailplate
index 0cceef1c8c674a0c50413464764491fda58b1eb6..c7a02b98a603ca17dcb18d45e22de834239467a4 100755 (executable)
--- a/mailplate
+++ b/mailplate
@@ -415,10 +415,14 @@ for line in templ:
         l = line[:-1]
         if len(l) == 0:
             payload = '' # end of headers
-        elif l[0] == KEEP_SLOT_LEADER and KEEP_HEADERS.has_key(l[1:]):
-            # found predefined header slot keyword
-            for header in KEEP_HEADERS[l[1:]]:
-                headers[header.lower()] = (header, _keep_header)
+        elif l[0] == KEEP_SLOT_LEADER:
+            if KEEP_HEADERS.has_key(l[1:]):
+                # found predefined header slot keyword
+                for header in KEEP_HEADERS[l[1:]]:
+                    headers[header.lower()] = (header, _keep_header)
+            else:
+                err('unknown header slot ' + l + ' found')
+                sys.exit(posix.EX_CONFIG)
         else:
             header, content = l.split(':', 1)
             content = content.strip()