We can't tell you anything specific without seeing the non delivery report. Why was it not included? Most likely you've made an error when typing the E-mail address. Try using the telephone, and ask your correspondant to send you an E-mail. From that you can get the correctly spelled e-mail address. Carl _____ From: Bruce J. Rose [mailto:brose@xxxxxxxxxxx] Sent: Thursday, December 22, 2005 2:15 PM To: [ExchangeList] Subject: [exchangelist] Can't send mail to one email address I cannot send mail to a specific address at company A. I can send to other address at company A. I get non deliver report instantly so do not think the email is ever making it to the internet to fail. All other mail seems to be flowing in and out of exchange server. Server is windows 2000 Exchange Version 2003 sp1 Thanks Bruce Rose