New answers tagged server.app
It looks like your ISP has a firewall preventing you from sending emails from your server. To overcome that you need to create a an SMTP mail relay if your Internet service provider puts you behind a firewall that prevents you from sending e-mail directly from your server. See OS X server instructions how to do that.
I still don't know what caused the issue to come up in the first place, but I was able to get around it by going to Server.app > File Sharing > [my backup volume] > Edit Share Point... and then adding my user to the Access section of the page with Read & Write permissions. I don't know how/why it worked before or why changing the user password caused it ...
Yes this is possible. When prompted for the location of the home folder for the user you can choose any shared folder that you have configured to be used as storage for home folders in the File Sharing service. This folder can be anywhere on the machine or anywhere on the network.
In conclusion, TimeMachine recovery of the entire system to the status before changing admin password worked well. I recovered the old admin password and it worked for Keychain Access as well. In details; Just in case the recovery doesn't work and I lose the TimeMachine backups somehow, I copied the TimeMachine backup to another external drive. To do that, ...
I fixed this issue by adding the following line to /etc/ntp.conf interface ignore ipv6 and then restarting ntpd
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