The original message was received at Fri, 4 Apr 2008 12:12:03 -0500 from [207.115.32.11] ----- The following addresses had permanent fatal errors ----- &lt;zachs(a)pacbell.net&gt; (reason: 554 delivery error: dd Message undeliverable. Your email address is not listed in the Address Book o...ll.net -- http://help.yahoo.com/help/mail/us/greenlist.html [101] - mta115.sbc.mail.mud.yahoo.com) ----- Transcript of session follows ----- ... while talking to mx1.sbc.mail.yahoo.com.: <<< 554 delivery error: dd Message undeliverable. Your email address is not listed in the Address Book of zachs(a)pacbell.net -- http://help.yahoo.com/help/mail/us/greenlist.html [101] - mta115.sbc.mail.mud.yahoo.com 554 5.0.0 Service unavailable