Since Discourse now sets the default value of the disable mailing list mode setting to true, I looked into this some more. When disable mailing list mode is set to true, no mailing list emails are sent from Discourse. This means that the setting completely disables mailing list mode for the site. The user’s options are not changed though - if you set disable mailing list mode to false after having set it to true, users who had previously selected the mailing list mode option will start to receive mailing list emails again. This seems like the correct behaviour to me.
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