GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/359
Bug: archiver traverses multi-part message parts twice
The archiver code includes the following:
```
if msg.is_multipart():
for part in msg.walk():
if part.is_multipart():
for subpart in part.walk():
```
However the walk() iterator already includes nested sub-parts it its
processing.
As it happens this cannot affect the code output because only the first
matching part will be used, but it is wasteful. Furthermore, walk can also be
used on a non-multipart message, which allows the code to be much simplified.
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