If you look at the properties of the person you are replying to then you will probably see that the attributes are empty and more often than not an X500 address in the DisplayName. There are several reasons for this. More often than not I have seen this in a mixed mode environment. What type of environment are you running. Mark Shevill IMG Messaging Deputy Team Leader Shell Information Technology International Limited Rowlandsway, Wythenshawe, Manchester M22 5SB, United Kingdom Tel: +44 161 935 7152 Email: Mark.M.Shevill@xxxxxxxxxxxx Internet: http://www.shell.com -----Original Message----- From: DanC@xxxxxxxxxxxx [mailto:DanC@xxxxxxxxxxxx] Sent: 16 August 2002 17:30 To: [ExchangeList] Subject: [exchangelist] Unable to send to certain email addresses http://www.MSExchange.org/ I have a couple of email addresses my users can get email from but when they reply they get the Sys Admin message "The recipient name is not recognized" Any Ideas, Exchange has no errors that I can find in the event logs. Thanks. Daniel A. Crain Systems Administrator Dean, Ringers, Morgan & Lawton, P.A. 201 E. Pine Street, Suite 1200 Orlando, FL 32802 (407)422-4310 DanC@xxxxxxxxxxxx ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: Mark.Shevill@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')