> If it's more complicated than apt/yum install mailcow, followed by a nice friendly browser based configuration page, it's too complicated for widespread usage

> If it's more complicated than apt/yum install mailcow, followed by a nice friendly browser based configuration page, it's too complicated for widespread usage. It's a bit more complicated than that but the simplest solution I know. > This includes, having out of the box configuration, that makes the email acceptable by Microsoft/Gmail etc. This is unfortunately impossible. You can have a perfectly valid configuration including reverse DNS, SPF, DKIM and DMARC, yet Microsoft's email servers will still let your mails vanish.