There are a few things need to pay attention when using the email related function.
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The first thing is that the default Email plugin or Email provider “Sendmail” is not production ready and need to config which does not provide too much options. So if like to use email gateway like your own email hosting with modern secured smtp support, need to install extra provider.
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For email provider example, could refer to this tutorial and install that email providers accordingly.
https://strapi.io/blog/automating-emails-with-strapi-cron-jobs
Other email and providers related reading, could refer: