Add variable to choose whether to bounce or reject email when recipient is unknown. Fixes #583 #626
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As described in #583, Mailu bounces email when recipient is unknown.
This PR add a variable (in .env) to choose whether to reject or to bounce.
If the variable is not set, the current Mailu behaviour is kept (equivalent to set it to "no")
To REJECT mail, the .env file has to set the variable to yes