Postfix smarthost
1. Set up a password maps file (/etc/postfix/sasl_passwd) as follows:
mail.domain.tld:587 username:password
2. chown root:root /etc/postfix/sasl_passwd; chmod 600 /etc/postfix/sasl_passwd
3. postmap /etc/postfix/sasl_passwd
4. In /etc/postfix/main.cf:
relayhost = mail.domain.tld:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options =
5. postfix reload
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