Block spoofing emails

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...
Vijay Kumar GajulaAsked:
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Shaun VermaakTechnical SpecialistCommented:
I have not used Postfix but I see they have an SPF plugin, have you tried it?
Rajul RajInformation Security OfficerCommented:
Apart from SPF, Set up Domain Keys Identified Mail on your own domain. That will digitally sign legitimate outgoing from your domain. More and more email providers are rejecting or flagging spoofed email where legit email is identified with a Domain Key signature.

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