Document that e-mail addresses can now be included in the "whitelist".

ctrl/dnsbl_exempt.cfg

-; List IP address or hostnames (one per line) of SMTP servers
-; which are exempt from DNS-Blacklist checking
+; DNS-Blacklist Exemptions (a.k.a. "whitelist")
+; List of IP addresses or hostnames of SMTP servers
+; or e-mail addresses in <user@domain> format
+; which are exempt from positive DNS-Blacklist results
 *.synchro.net
-64.148.159.*
\ No newline at end of file
+64.148.159.*
+<rob@synchro.net>
\ No newline at end of file