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Stop Outbound Phishing

Hi everyone,

we detected phishing spam mails are being sent at high rate from our single Exchange Server

Messages are sent by: "******@*******citibank.com", with this subject: "Your Credit Card Has Been Limited" from various External IPs.

We now deployed some network security filters, but I have one concern:

How do spammers use our Exchange connector to send mail as an external unmanaged domain ?
Why is it possible by default ? How to avoid it and allow messages sent by internal domain only ?

Thanks for helping !


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