we are hosting multiple domain email server inside our company ,we found that our IP address has been blacklist .May i know how to configure only the domain user able to send msg .Because l realize actually i just telnet smtp port then can use the server send msg without knowing the username and password.
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Servers >> Certificates…