I set the values in main.cf:

# postconf -n | grep -P '_reject_code = \d\d\d$'
plaintext_reject_code = 550
unknown_address_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550
unknown_local_recipient_reject_code = 550
unverified_recipient_reject_code = 550
unverified_sender_reject_code = 550

But I am still getting:

15   4xx Reject sender address                 100.00%

In log watch output.

I looked in the documentation for rejecting a sender address. Is this the 
correct value to set in main.cf to 550?

unknown_address_reject_code (default: 450)

Regards,
John
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