We have been using MDaemon for many years.
Current we have several version of the software. The latest was purchased in 2020 with product key
Registration Key: 14ARK44-WQ7UXK7-5JDTF1V
This key is used on mail8b.exchangemailserver.net, also same server for mail.bretabennett.com
On 03/12/2020, key entered into smtp25.mailflow.us - 2nd activation so far.
On 03/17/2020, key entered into mail10e.exchangemailserver.net - 3rd activation so far. - on 05/17/2020 updated OS from 2008R2 to 2012R2 to 2019. - On 07/11/2020 updated to MDaemon 20.0
On03/19/2020, key entered into mail8j.exchangemailserver.net - 4th activation.
The above note has been moved to Last Pass since 01/25/2021.