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I'm new to Exchange 2019. Is it normal behaviour that anyone can send an email via my server to ANY email?

I can successfully send an email via this PS command:

 Send-MailMessage -From '[email protected]' -To '[email protected]'
 Subject "Alert from Server1" -Body "It is email body" –SmtpServer 'exchange-server'

How can I prevent this?

本文标签: Exchange 2019 smtp no authStack Overflow