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Description
In Chamilo 1.11.x the mailing configuration is in the file app/config/mail.conf.php
This setting is not automatically transferred to .env file in the following directive :
###> symfony/mailer ###
#MAILER_DSN=*******
###< symfony/mailer ###
There are to many different cases to try to manage it automatically so it would probably be better to indicate it in the migration process as a manual action.