Using Discourse as a mailing list

  1. Click your user icon, then your user name:
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  2. Click “Preferences”:
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  3. Click “Emails”:
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  4. Click “Enable mailing list mode”, and select the frequency of emails:
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  5. By default, you will be subscribed to posts in all categories. To disable notifications for a category, visit the category page:
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    and select the “Muted” option in the notification preference menu:

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  6. To respond via email, simply click “Reply” in your mail client, and reply as indicated in the email footer.

  7. To post a new topic via email, use the following addresses:

Can it be configured to not send HTML emails?

I do not think that it is possible to change that setting on a user basis.