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    Jun 02 01:18:57 Ubuntu-1804-bionic-64-minimal amavis[14528]: Starting amavisd:   The value of variable $myhostname is "Ubuntu-1804-bionic-64-minimal", but should have been
    Jun 02 01:18:57 Ubuntu-1804-bionic-64-minimal amavis[14528]:   a fully qualified domain name; perhaps uname(3) did not provide such.
    Jun 02 01:18:57 Ubuntu-1804-bionic-64-minimal amavis[14528]:   You must explicitly assign a FQDN of this host to variable $myhostname
    Jun 02 01:18:57 Ubuntu-1804-bionic-64-minimal amavis[14528]:   in /etc/amavis/conf.d/05-node_id, or fix what uname(3) provides as a host's
    Jun 02 01:18:57 Ubuntu-1804-bionic-64-minimal amavis[14528]:   network name!
    Jun 02 01:18:57 Ubuntu-1804-bionic-64-minimal amavis[14528]: (failed).