Как настроить postfix при отправке электронной почты необходимо войти в систему?

Как настроить postfix, когда для отправки электронной почты необходимо войти в систему? У меня есть сервер конфигурации postfix для отправки электронной почты моим клиентам. Я обнаружил, что postfix может отправлять почту без логина. Я сомневаюсь, что это может быть использовано для других, рассылающих спам, так кто же может мне помочь?

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
append_dot_mydomain = no
#delay_warning_time = 4h
readme_directory = no
smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
myhostname = domain.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = domain.com, localhost
#mydestination = hash:/etc/postfix/mydomains
relayhost =
relay_domains = gmail.com,hotmail.com,163.com,qq.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
home_mailbox = Maildir/
mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}"
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_auth_enable = yes 
smtpd_sasl_security_options = noanonymous
smtp_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
#smtpd_recipient_restrictions = permit_sasl_authenticated, reject_unauth_destination,reject_unknown_sender_domain, reject_unauth_pipelining
#smtpd_recipient_restrictions = reject_unauth_pipelining
smtpd_recipient_restrictions = permit_mynetworks,reject_invalid_hostname,reject_non_fqdn_hostname,reject_non_fqdn_sender,reject_non_fqdn_recipient,reject_unauth_destination,reject_unknown_sender_domain,reject_unknown_recipient_domain,reject_rbl_client bl.spamcop.net,permit
smtpd_helo_restrictions =
    permit_mynetworks,
    reject_non_fqdn_hostname,
    reject_invalid_hostname,
    permit
#smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtp_tls_security_level = may
smtpd_tls_security_level = may
smtpd_tls_auth_only = no
smtp_tls_note_starttls_offer = yes
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
policy-spf_time_limit = 3600s
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_authenticated_header = yes
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_client_restrictions = sleep 1,reject_unauth_pipelining, permit_sasl_authenticated
smtp_use_tls = yes
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_mandatory_ciphers = medium

#authorized_submit_users = bitwolaiye
smtpd_helo_required = yes
smtp_sasl_mechanism_filter = plain, login