Setup Postfix as a Send-Only External SMTP Relay
Self-hosting a mail server can be a great learning experience. I recently set up an email server using Docker Mail-Server and I ran into an issue with outgoing mail where my public IP was on a policy blocklist. This caused almost all of my outgoing emails to be blocked. If you are faced with this problem, there are two directions you can go. You can sign up for an SMTP service, some are even free up to a certain number of emails, or you can run a postfix relay in a VPS. I like to have control of the underlying infrastructure, so I went with the latter. This guide will walk you through how to configure the Postfix relay server on the VPS so that it only accepts mail from your mail server's IP or from a server with a certificate that matches your mail server's hostname.
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https://tictactech.net/category-blog/lin...smtp-relay
Self-hosting a mail server can be a great learning experience. I recently set up an email server using Docker Mail-Server and I ran into an issue with outgoing mail where my public IP was on a policy blocklist. This caused almost all of my outgoing emails to be blocked. If you are faced with this problem, there are two directions you can go. You can sign up for an SMTP service, some are even free up to a certain number of emails, or you can run a postfix relay in a VPS. I like to have control of the underlying infrastructure, so I went with the latter. This guide will walk you through how to configure the Postfix relay server on the VPS so that it only accepts mail from your mail server's IP or from a server with a certificate that matches your mail server's hostname.
Read More …
https://tictactech.net/category-blog/lin...smtp-relay
