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Postfix Documentation
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Sender address verification for mail from frequently forged domains

It is relatively safe to turn on sender address verification for specific domains that often appear in forged email.

/etc/postfix/
main.cf:
    
smtpd_sender_restrictions = hash:/etc/postfix/sender_access
    
unverified_sender_reject_code = 550
    # Note 1: Be sure to read the "
Caching" section below!
    # Note 2: Avoid hash files here. Use btree instead.
    
address_verify_map = btree:/var/mta/verify
 
/etc/postfix/sender_access:
    aol.com     
reject_unverified_sender
    hotmail.com 
reject_unverified_sender
    bigfoot.com 
reject_unverified_sender
    ... etcetera ...

At some point in cyberspace/time, a list of frequently forged MAIL FROM domains could be found at https://www.monkeys.com/anti-spam/filtering/sender-domain-validate.in.

NOTE: One of the first things you might want to do is to turn on sender address verification for all your own domains.

Postfix Documentation
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