as_string(): Indicate that this mangles From_ lines.
diff --git a/Lib/email/Message.py b/Lib/email/Message.py
index d23a26f..977f802 100644
--- a/Lib/email/Message.py
+++ b/Lib/email/Message.py
@@ -119,7 +119,8 @@
header.
This is a convenience method and may not generate the message exactly
- as you intend. For more flexibility, use the flatten() method of a
+ as you intend because by default it mangles lines that begin with
+ "From ". For more flexibility, use the flatten() method of a
Generator instance.
"""
from email.Generator import Generator