security settings
Switch from your current mailserver to RealSender safe environment.
You may use the same authentication credentials
as well as the smtp hostname, when it is under your domain name.
You can send email messages securely, even without authentication.
Topics in this area:
authorized senders
only the declared senders are allowed to pass through
protected by fail2ban
unauthorized accesses are identified, blocked and banned after three failed attempts
extra security settings
optional extra security configurations