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CFEngine3

# Set username and password
smtp_sasl_password_maps = static:{{ smtp_service_user }}:{{ smtp_service_pass }}
smtp_sasl_security_options = noanonymous
# Turn on tls encryption
# smtp_tls_security_level = encrypt
header_size_limit = 4096000
# Set external SMTP relay host here IP or hostname accepted along with a port number.
relayhost = {{ smtp_internal_host }}:25
# accept email from our web-server only (adjust to match your VPC/VLAN etc)
inet_interfaces = 127.0.0.1