Reject mail?

[inetd]

How to configure postfix to reject mail that come from an invalid email address?

for example:
Someone sent me a mail with From: abc@somedomain.com. However the email address of 'abc@somedomain.com' is an invalid email.

How can I reject this kind of mail?

Thanks.

 

[pupu]

How do you know that the address is 'invalid'?

 

[jshf]

config 'smtpd_client_restrictions' the option