remove surrogates from headers again, the cause troubles

pymodmilter/__init__.py

@@ -21,7 +21,7 @@ __all__ = [
     "ModifyMilterConfig",
     "ModifyMilter"]
 
-__version__ = "1.1.5"
+__version__ = "1.1.6"
 
 from pymodmilter import _runtime_patches
 

pymodmilter/base.py

@@ -136,8 +136,5 @@ class MilterMessage(MIMEPart):
 
 
 def replace_illegal_chars(string):
-    """Replace illegal characters in header values."""
+    """Remove illegal characters from header values."""
-    return string.replace(
+    return "".join(string.replace("\x00", "").splitlines())
-        "\x00", "").replace(
-        "\r", "").replace(
-        "\n", "")