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-rw-r--r--src/mailman_pgp/utils/email.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mailman_pgp/utils/email.py b/src/mailman_pgp/utils/email.py
index d1efc40..a936458 100644
--- a/src/mailman_pgp/utils/email.py
+++ b/src/mailman_pgp/utils/email.py
@@ -50,7 +50,8 @@ def overwrite_message(from_msg, to_msg):
:param to_msg: The destination `Message`.
:type to_msg: email.message.Message
"""
- del to_msg[:]
+ for key in to_msg.keys():
+ del to_msg[key]
for key, value in from_msg.items():
to_msg[key] = value
to_msg.set_unixfrom(from_msg.get_unixfrom())