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This option can be particularly helpful when OPS department make lots of changes in Crew Duties section and it is desired that crew members are informed about any change in their roster. Whether it is about the brand new duty assigned or a duty that has just been replaced by a different one - Leon will send an email to the recipient.
The option is enabled to all crew members by default. In the profile page of each Leon user you can find a checkbox automatically ticked. By unticking it you disable sending roster changes emails.