@sampo2910 of None is the only option that works, then that's probably the only one your email provider supports. It should be fine as long as you don't need your emails to be perfectly secure.
variables.set is deprecated
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[deprecated] variables.set is deprecated, please use ajaxify.data, key=category_id
[deprecated] variables.set is deprecated, please use ajaxify.data, key=category_name
[deprecated] variables.set is deprecated, please use ajaxify.data, key=category_slug
[deprecated] variables.set is deprecated, please use ajaxify.data, key=topic_count
[deprecated] variables.set is deprecated, please use ajaxify.data, key=currentPage
[deprecated] variables.set is deprecated, please use ajaxify.data, key=pageCountnodebb.min.js:10
Why are these errors appear in the console?
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https://community.nodebb.org/topic/5942/ajaxify-variables-get-deprecated
You don't have to worry about it if you are not developing plugins.