Bureaucrats, confirmed, Administrators
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Changes
might need the CA file
# work-around for Digital Ocean's blocking of IPv6 for email
smtp_bind_address = 0.0.0.0
# or set inet_protocols = ipv4
# satellite configuration
smtp_use_tls = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
# list of CAs to trust when verifying server certificate
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
HERE