Yeah that's what I was thinking but was not quite sure if there are some systems or applications that just block the entire root domain. Thanks. ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Greg Lara Sent: Tuesday, March 21, 2006 2:32 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: Blacklisting It's always been my impression that a domain is blacklisted based on it's IP address. So if west.company.com has an independent MX record, from a DNS standpoint there would be no association with east.company.com and therefore no reason for the east domain to be blacklisted. Greg Lara ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of ChongJa@xxxxxxxxxxxxxxxx Sent: Tuesday, March 21, 2006 2:22 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Blacklisting Let's say you are east.company.com and you also host MX records for west.company.com and so forth. If west.company.com was compromised and get blacklisted, can they potentially get the root domain company.com blacklisted? I'm thinking each domain is autonomous and only the individual domains would get blacklisted and not the entire root. Anybody know for certain? Thanks. James Chong ETS Sr. Exchange Engineer Office: 703.206.7548 Cell: 703.863.1483 chongja@xxxxxxxxxxxxxxxx