>>> host in hosts_connection_nolog? no (option unset)
>>> host in host_lookup? no (option unset)
>>> host in host_reject_connection? no (option unset)
>>> host in sender_unqualified_hosts? no (option unset)
>>> host in recipient_unqualified_hosts? no (option unset)
>>> host in helo_verify_hosts? no (option unset)
>>> host in helo_try_verify_hosts? no (option unset)
>>> host in helo_accept_junk_hosts? no (option unset)
>>> xxxx in helo_lookup_domains?
>>>  list element: @
>>>  list element: @[]
>>> xxxx in helo_lookup_domains? no (end of list)
LOG: SMTP call from (xxxx) [V4NET.0.0.1] dropped: too many syntax or protocol errors (last command was "rcpt to:<bad syntax@x.y.z>",  C=HELO,MAIL,RCPT,RCPT,RCPT,RCPT)