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[pfaffman (Jay Pfaffman)]

@rsx

For me it’s confusing that I should configure SPF and DKIM while having credentials to login in a mail server

Well, if you want to send mail that’s what you have to do. If you have heard of unsolicited email, these are some things that have been done to mitigate it. Have a look at Troubleshooting email on a new Discourse install.