Quoting Ruben Pollan (2017-11-15 23:29:54)
> Message.get_property (prop) returns a string with the value of the property.

I only implemented get_property as is the only one I need to add support for 
session keys in alot (https://github.com/meskio/alot/tree/session-key). From the 
point of view of the MUAs I don't see much interest in exporting all the other 
functions to modify properties. But I was not sure if adding them to have the 
whole set of message property functions in python.

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