ed723b Install and configure postfix on all VMs

Authored and Committed by Christian Boltz 4 years ago
    Install and configure postfix on all VMs
    
    - install and start postfix
    - setup root -> admin-auto@o.o alias
    - set relayhost relay.infra.o.o (except for machines with the proxy
      role, namely anna and elsa)
    
        
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