Github user billywatson commented on the issue:
https://github.com/apache/incubator-ponymail/issues/113
So in my estimation, the two-way encoding idea (it's not really hashing,
I'm figuring out) doesn't really work because it doesn't actually shorten
anything. Base64 encoding the current URLs or message IDs actually makes them
longer.
If we do want shorter permalinks, and it sounds like we're headed that way,
I think we would have to use the database. I was trying to stay away from a
database-dependent solution, but I'm not sure how to avoid it at this point.
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