I need one of my VPS servers set up as a simple "outgoing" SMTP relay server. I don't need multiple users, incoming mail, spam filtering, virus protection, control panels, or any of that...I just need to be able to connect to the server from my mailing program and send out my newsletters through it. The VPS server is already setup and running, the email functionality just needs to be added.
The VPS isn't big, so I don't want Virtualmin, iRedMail or anything like that installed that will use up all the server resources. I should only need something like the following:
1. Postfix & Dovecot
2. DKIM & SPF
3. SASL authentication & SSL certificate (self-signed is ok)
4. One user (news[at]example.com)
In addition to it functioning properly, the most important thing I need is a step-by-step instructional list (or screen capture video) of the complete process (i.e. all lines of code entered in Ubuntu, modified files, etc.). I must be able to take what you do and replicate it for my other sites.
The server OS is Ubuntu 10.04