Did you try aGoogling? http://www.google.com/search?client=googlet&q=88.blacklist.zap http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q _22032047.html John T eServices For You "Seek, and ye shall find!" -----Original Message----- From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Danny Sent: Tuesday, October 24, 2006 9:22 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] 88.blacklist.zap - Anyone know where this blacklist is? The following recipient(s) could not be reached: username@xxxxxxxxxxx on 24/10/2006 10:33 AM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <srv.example.ca #5.5.0 smtp;550 Service unavailable; Client host [123.123.123.123] blocked using 88.blacklist.zap; Mail From IP Banned> <Note: the real domains and IP addresses were replaced in the error> I will contact the recipients email administrator to see if they know! Thanks, ...D