أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Open relay is nothing but unknown user can send emails using the server nor from or to local users.
Hi,
Microsoft Exchange server is not configured by default as open relay, if you want to reconfigure it then you have to configure the accepted domains and SMTP connectors.
Regards,