sebbASF commented on pull request #517:
URL: 
https://github.com/apache/incubator-ponymail/pull/517#issuecomment-693319064


   There is a trade-off here.
   
   Let's call the two Permalink designs O and OL, where:
   
   O = opaque hash created from the message source *plus* the LID (if it 
differs from the LID in the headers)
   
   OL = opaque hash created from the message source only. If the LID differs 
from the headers, it is appended to the opaque hash.
   
   Style O
   -------
   Advantage: fixed Permalink style
   Disadvantage: not feasible to regenerate Permalinks without a separate 
database to relate the LIDs to the messages
   
   Style OL
   -------
   Advantage: can regenerate Permalinks from just the mail sources
   Disadvantage: Permalinks are longer for some mails
   
   Neither is perfect; seems to me that the appropriate choice will depend on 
the installation.


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