GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/178
Bug: shortLinks are not guaranteed unique, especially with the original
generator
The shortLink feature works by truncating the database message id to 18
charactes and then converting it to base 36. To recover a message, the short
link is decoded, and the first matching mail with the same prefix is returned.
In the case of the original generator, the first 18 characters of the id
only depend on the message body. If the same message is sent to multiple
mailing lists, they will all have the same shortLink. However only one will
ever be retrieved currently.
In the case of the "medium" generator, the first 18 characters are part of
a sha256 hash which will be unique within the database. There are billions of
hashes with the same prefix, however the chances of two having the same prefix
should be very small, but not impossible.
One solution is to ensure that shortLinks return all matching messages
rather than just the first match.
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