troubleshooting Question

smtp security for hmail server

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YaYangTeahFlag for Malaysia asked on
Email ServersEmail ProtocolsEmail Clients
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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.
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