[exim] Reversable crypt function

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Autor: Chris Laif
Data:  
Para: exim-users
Assunto: [exim] Reversable crypt function
As far as I can see exim offers some one-way encryption (hash)
functions. I wonder if there also is a reverseable crypt-function.

I would like to encrypt the authentication information stored in the
email header with a secret key. Persons who know this key will be
able to extract this information in case of problems.

Chris