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Stop Spam From the Inside by Locking Down SMTP

piaakit asked
Last Modified: 2015-04-14
Hi All

       how do i Stop Spam From the Inside by Locking Down SMTP, some people from outside using smtp auth mail relay on my exchange server, how do i restrict mail relay by using smtp auth ? can i block it by specific public ip addresses ? for example if someone using amtp auth with public ip from outside network, can my exchange block the remote ip using smtp auth other than the internal subnet from exchange server ?

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