[Exim] What's up?

I have the following setup in my configuration file,


receiver_verify = true
sender_verify = true
headers_sender_verify = true
headers_checks_fail = true
headers_check_syntax = true
sender_verify_fixup = true
sender_verify_reject = true
sender_verify_hosts = *
sender_verify_hosts_callback = *
sender_verify_callback_domains = *


Why is Exim still accepting mail from addresses like the following
which do not exist?


From: rxgibfakesbfyegl@???
To: psaejgbuxsfalxja@???
Subject: No Fee! Accept Credit Cards Today!
Date: Sun, 17 Feb 2002 22:58:47 -0800


Thanks