Postfix gives a few minor errors which can be easily fixed.

warning: database /etc/postfix/relay_domains.db is older than source file /etc/postfix/relay_domains
warning: database /etc/postfix/transport.db is older than source file /etc/postfix/transport
warning: database /etc/postfix/sender_rules.db is older than source file /etc/postfix/sender_rules
warning: database /etc/postfix/recipient_rules.db is older than source file /etc/postfix/recipient_rules

These errors can be fixed with the following commands.

postmap /etc/postfix/transport
postmap /etc/postfix/relay_domains
postmap /etc/postfix/sender_rules
postmap /etc/postfix/recipient_rules

After that a restartsmtpscan.py to reload postfix.