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Hi, I am receiving a lot of spam that has the from @mydomain, I have 2 servers, one only for internal mail, and the other for the external, in the external server, is there a way to block the mails from the exterior that are from @mydomain and not originated in any of my servers?
In other words, I want to allow sending mail from @mydomain from my network, but do not receive any from @mydomain from externals ips.
Thanks
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