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I have not used Postfix but I see they have an SPF plugin, have you tried it?
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Can any one let me know how to block spoofing emails in Postfix. I am getting junk from my own domain with non existing sender...
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Can any one let me know how to block spoofing emails in Postfix. I am getting junk from my own domain with non existing sender...

Block spoofing emails

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.