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biff = no
mydomain = XXX.com
myorigin = $mydomain
mydestination =
relayhost = mail.XXX.com:587
mynetworks = 127.0.0.0/8 [::1]/128
inet_interfaces = loopback-only
inet_protocols = ipv4, ipv6
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options =
smtp_use_tls = yes