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How to send email from within a VPS correctly
Based on my (limited) experience I wrote this blog item:
https://pengfamily.de/send-email-correctly-from-within-ubuntu-vps/
I hope this helps to you too. 
Comments
That PERL script at the end is really juicy one
thank you!
Nice guide thanks for sharing
I've also worked on a similar solution recently but based on docker, it will also generate spf/dkim and indicate how to configure your dns for great delivery. It's 100% in bash
https://github.com/elestio/cloudgate/blob/master/SMTP/startPostfix.sh
You don't need "within" in your title. That implies internal mail between users of the VPS.