When sending to a single user it bounces back two undeliverable messages from two users that have not been users in the GAL for two years? We have recently migrated from Exchange 2003 to 2007 - Syntax of Error is below: Any help would be much appriciated - Thanks Delivery has failed to these recipients or distribution lists: USERNAME1 The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator USERNAME2The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator. _____ Sent by Microsoft Exchange Server 2007

Hello Martin, Looks like some stale forwarding entries are there for the user id to whome you are sending mail. Are you sending simple mail or meeting/appointment? If simple mail then check the outlook rules ofmailbox if it has any forwarding rule set. Additonally you can check below article for stale rules.. http://exchangeshare.wordpress.com/2008/04/10/delete-corrupted-hidden-or-stale-rules-from-mailbox-with-mfcmapi/ If you are sending meeting/appointment then check below thread. http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=3647697&SiteID=17

Its a meeting/appoitment - normalsimple mail is fine - I have been through the users mailbox and delegates list and looked through all server entries and even gone in to properties of ADSIEDIT and still cannot find any mention of them particular two people. Ill look through that article - thanks for that.

Yes, then you need to remove stale delegate rule by using MFCMapi

Thats worked a treat! :-) Thanks a lot for your help! Martin