Hello I installed a postfix MTA on a VPS with a domain linked to it. The email forwarder (via aliases) and various mail-man mailing lists run on the server for Postfix. The outgoing emails are also signed for Dkim via opedkim and DMARC is activated This works correctly and https://www.mail-tester.com/ shows a 10 when I send an email via the command line. So far so good.
Now I want to send an email from home with email@example.com At the moment this goes through the service provider (xs4all) and often the email does arrive. However, a test via the above site gives a bad score.
My question: What is the minimum requirement to have the email @ home (via email client) sent via the VPS? So I am only looking for sending via and not a complete server with mailboxes, databases etc. Just say half an imap server (send only) Peter