Unfortunately, the E-mail on Post, the Notify checkbox below, and the Forum Preferences - although all seem to allow Members to turn off E-mail Notifications - do not affect each other nor do they disable e-mails; with the exception of the Notify checkbox below, if you uncheck it in every post you make.

I have opted to filter any e-bot messages to the bit bucket just in case I forget to uncheck the box. :0)

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Perhaps, kb, you can bring this up to the development/programming team again and see if they can get all of these options coordinated?