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-rw-r--r--Doc/library/email.generator.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Doc/library/email.generator.rst b/Doc/library/email.generator.rst
index 2575a51..fc535a3 100644
--- a/Doc/library/email.generator.rst
+++ b/Doc/library/email.generator.rst
@@ -36,6 +36,10 @@ something that contains only ASCII characters, using the standard email RFC
Content Transfer Encoding techniques for encoding email messages for transport
over channels that are not "8 bit clean".
+To accomodate reproducible processing of SMIME-signed messages
+:class:`Generator` disables header folding for message parts of type
+``multipart/signed`` and all subparts.
+
.. class:: BytesGenerator(outfp, mangle_from_=None, maxheaderlen=None, *, \
policy=None)