Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/178
Old shortlinks will work in the sense that they will find a match.
However they won't work in the sense that they find the right match.
The old shortlinks effectively threw away all but the body hash when
applied to the original ids.
Since the body hash is far from unique, the old shortlinks were also not
unique.
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