1 files changed, 21 insertions, 0 deletions

diff --git a/src/mailman_pgp/utils/email.py b/src/mailman_pgp/utils/email.py
index a936458..ac1ab66 100644
--- a/src/mailman_pgp/utils/email.py
+++ b/src/mailman_pgp/utils/email.py
@@ -16,8 +16,10 @@
 # this program.  If not, see <http://www.gnu.org/licenses/>.
 
 """"""
+import copy
 from email.utils import parseaddr
 
+from mailman.email.message import MultipartDigestMessage
 from public import public
 
 
@@ -62,6 +64,25 @@ def overwrite_message(from_msg, to_msg):
 
 
 @public
+def make_multipart(msg):
+    """
+
+    :param msg:
+    :type msg: email.message.Message
+    :return:
+    :rtype: email.message.MIMEMultipart|
+            mailman.email.message.MultipartDigestMessage
+    """
+    if msg.is_multipart():
+        out = copy.deepcopy(msg)
+    else:
+        out = MultipartDigestMessage()
+        out.attach(msg)
+        copy_headers(msg, out)
+    return out
+
+
+@public
 def get_email(msg):
     display_name, email = parseaddr(msg['from'])
     # Address could be None or the empty string.