services/healthcheck/data/template.msmtprc

defaults
auth on
tls on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
logfile /tmp/msmtp.log

account default
host ${MAIL_HOST}
port ${MAIL_PORT}
tls_starttls on
from ${MAIL_USER}
user ${MAIL_USER}
password ${MAIL_PASS}