# Set banner
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)

# Disable local mail notifications
biff = no

# Alias locations
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases

# Local name, should match the machine's FQDN
myhostname = ucware.beispiel.org

# Mail for those domains will *not* be sent to the relay host
mydestination = $myhostname localhost

# Server to relay mails to
relayhost = [smtp.beispiel.org]

# Accept local mail only
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
inet_interfaces = loopback-only
inet_protocols = ipv4

# Authenticate when talking to other servers
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noplaintext noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_password

# Use system SSL certificates
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

# Set default relay restrictions
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, defer_unauth_destination