How to setup ubuntu mail server?

Question

Email

There is a domain, an ubuntu 16 droplet on DO that contains a rails application
, you need mail accounts for employees with a custom domain, and either for mail to come to their mail clients, or a web interface at mail.example.com
How to arrange all this?
As far as I understand now, you need a separate droplet and put postfix on it?

Answer 1

I installed iRedMail, there are even guides on the digital ocean youtube channel.
everything works, thank you all, goodbye to all

Answer 2

Well, this is not the easiest task, to be honest.
The config of all this is quite large in volume and time.
You can use some bundles, such as postfix + dovecot + spamasassin + clamav.
And, as a web interface, use webmail or openmailbox (good solution) or squirrelmail or rainloop (this one is the most beautiful and convenient, even protonmail.com works on it
) even using step-by-step instructions from Google. Therefore, look for the most convenient set of related technologies for you, a beautiful web interface, based on your OS version.