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Exchange 2010 - SPAM using organization internal addresses

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Last Modified: 2016-04-04
Hi,

Since a few days, we’re receiving SPAM with our own internal email addresses;
I guess the spammers are using an Exchange configuration which allow to send mail with internal users without authentication (MAIL FROM : user@myorg.com).

My question is quite simple: is there a way to prevent this ?

Do we got to configure that on the receive connectors properties ?
(We actually got 2: one on 25 port, another one on 465 port).

Thanks.
FB
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