I have Ubuntu 18.04 server. I have installed Postfix. I have set SPF record for domain + DKIM + TLS. Everything is working. Basically I can send emails via PHP scripts.
Now I want to send emails from this server by connecting to it via SMTP from remote server. How do I do that? I think I have to install Dovecot? Or can I use relay? I need simple solution. Simple authentication and send that email. That would be it.
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