SenderID information is obtained from the DNS servers that have the zone record. Really Andrew, you should spend more of your own time researching all this stuff rather than taking the easy road and asking us for all the answers. Oh, wait, I forgot for a minute who I was responding to. John T eServices For You "Seek, and ye shall find!" -----Original Message----- From: Andrew English [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew English Sent: Wednesday, May 17, 2006 11:46 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: Sender ID error I keep getting "Sender Id must be configured with a list of trusted mail servers before it can be enabled." in my application long. When I look at Sender ID in IMF I don't see a place were to put the IP address of my local SMTP server!? Regards, Andrew