- Correct line separtor after AAR header field (LP: #2049018) - Thanks to Nikolay Vizovitin for the report and the fix

ChangeLog

@@ -4,6 +4,8 @@ UNRELEASED Version 1.1.7
    - Correct ARC signing for AR headers with authres-version or comments
      before resinfo (LP: #2052526) - Thanks to Nikolay Vizovitin for the
      report and the fix
+   - Correct line separtor after AAR header field (LP: #2049018) - Thanks to
+     Nikolay Vizovitin for the report and the fix
 
 2024-04-14 Version 1.1.6
    - Use raw byte string for regex; fixes SyntaxWarning in Python 3.12 due to

dkim/__init__.py

@@ -1118,8 +1118,7 @@ class ARC(DomainSigner):
       arc_headers = []
 
     # Compute ARC-Authentication-Results
-    aar_value = ("i=%d; " % instance).encode('utf-8') + auth_results
-    if aar_value[-1] != b'\n': aar_value += b'\r\n'
+    aar_value = ("i=%d; " % instance).encode('utf-8') + auth_results.rstrip() + self.linesep
 
     new_arc_set.append(b"ARC-Authentication-Results: " + aar_value)
     self.headers.insert(0, (b"arc-authentication-results", aar_value))