Hestia will provide working mail, but also as described in our intro post (Please read this, before you start!), hestia is not a sysadmin replacement and cant provide then knowledge for you 
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@Felix Thanks for the detailed and correct answer!
Hestia will provide working mail, but also as described in our intro post (Please read this, before you start!), hestia is not a sysadmin replacement and cant provide then knowledge for you .
@Felix Thanks for the detailed and correct answer!