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 user@domain.nl 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

  • Why do you not send the email directly to your server? There is no reason to send it to your ISP. – Michael Hampton Oct 19 '20 at 19:09
  • Thats exact the idea. But what are the requirements at the server side that it will accept email from a client? – qro Oct 20 '20 at 13:40
  • You enabled submission in master.cf – Michael Hampton Oct 20 '20 at 16:03

Minimum requirements of MTA connecting to other MTAs are:

  1. Your MTA use HELO with a correct server name.
  2. Your server name resolved into source IP address.
  3. Source IP is resolved into that name.
  4. If domain have SPF records - IP address should be allowed to send mail from this domain.

Also, not required but strictly needed is not having that IP in spam databases.

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