Is there a detailed instruction how to set up email sending with strapi on localhost and on prod?

I have Strapi project locally and on VPS, I’m trying to set up email sending (with registration for example) and I don’t understand how to set it up. I understood that there can be different email providers and semdmail is the default one. I tried to set up sendmail on VPS, it’s running but email sending doesn’t work and also I can’t check it locally.
Please, help me, I would appriciate any instructions or ideas.
Thank you.

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