To all experts in exchange/SMTP/ISASERVER: I have the following configurations: ABC Company has Windows 2k, Exchange 2K, ISASERVER, mail is using SMTP Customer has Windows NT, Exchange 5.5 using IMAP, exchange server has two nic cards, one connected through their network and the other directly connected to the internet. (no proxy server). All users at ABC Company has no problem sending e-mail to customer. Users at customer who send e-mail to ABC Company sometimes gets the attached e-mail below. They try several times and sometimes e-mail will get through but claims they get NDR most of the time. Any help is highly appreciated. ----Original Message----- From: System Administrator Sent: Monday, March 03, 2003 7:49 AM To: gedge@xxxxxxxxxxx <http://lw9fd.law9.hotmail.msn.com/cgi-bin/compose?mailto=1&msg=MSG10466 95773.26&start=1607827&len=7021&src=&type=x&to=gedge%40abchome%2ecom&cc= &bcc=&subject=&body=&curmbox=F000000001&a=fe91c543efb44218174cf2999997d2 6b> ; mgshop-nyc@xxxxxxxxxxx Subject <http://lw9fd.law9.hotmail.msn.com/cgi-bin/compose?mailto=1&msg=MSG10466 95773.26&start=1607827&len=7021&src=&type=x&to=mgshop%2dnyc%40abchome%2e comSubject&cc=&bcc=&subject=&body=&curmbox=F000000001&a=fe91c543efb44218 174cf2999997d26b> : Undeliverable: Market Appointment: Wednesday April 2nd 4pm Your message did not reach some or all of the intended recipients. Subject: Market Appointment: Wednesday April 2nd 4pm Sent: 3/3/2003 7:49 AM The following recipient(s) could not be reached: gedge@xxxxxxxxxxx <http://lw9fd.law9.hotmail.msn.com/cgi-bin/compose?mailto=1&msg=MSG10466 95773.26&start=1607827&len=7021&src=&type=x&to=gedge%40abchome%2ecom&cc= &bcc=&subject=&body=&curmbox=F000000001&a=fe91c543efb44218174cf2999997d2 6b> on 3/3/2003 7:49 AM The recipient name is not recognized The MTS-ID of the original message is: c=US;a= ;p=Rowe Furniture;l=MGEXCHGE-030303124913Z-6846 MSEXCH:IMS:Rowe Furniture:MG:MGEXCHGE 3550 (000B09AA) 550 5.7.1 Unable to relay for gedge@xxxxxxxxxxx <http://lw9fd.law9.hotmail.msn.com/cgi-bin/compose?mailto=1&msg=MSG10466 95773.26&start=1607827&len=7021&src=&type=x&to=gedge%40abchome%2ecom&cc= &bcc=&subject=&body=&curmbox=F000000001&a=fe91c543efb44218174cf2999997d2 6b> mgshop-nyc@xxxxxxxxxxx <http://lw9fd.law9.hotmail.msn.com/cgi-bin/compose?mailto=1&msg=MSG10466 95773.26&start=1607827&len=7021&src=&type=x&to=mgshop%2dnyc%40abchome%2e com&cc=&bcc=&subject=&body=&curmbox=F000000001&a=fe91c543efb44218174cf29 99997d26b> on 3/3/2003 7:49 AM The recipient name is not recognized The MTS-ID of the original message is: c=US;a= ;p=Rowe Furniture;l=MGEXCHGE-030303124913Z-6846 MSEXCH:IMS:Rowe Furniture:MG:MGEXCHGE 3550 (000B09AA) 550 5.7.1 Unable to relay for mgshop-nyc@xxxxxxxxxxx <http://lw9fd.law9.hotmail.msn.com/cgi-bin/compose?mailto=1&msg=MSG10466 95773.26&start=1607827&len=7021&src=&type=x&to=mgshop%2dnyc%40abchome%2e com&cc=&bcc=&subject=&body=&curmbox=F000000001&a=fe91c543efb44218174cf29 99997d26b> Jay Apolinario ABC Carpet & Home 888 Broadway NY, NY 10003 212 473-3000 X717 japolinario@xxxxxxxxxxx <mailto:japolinarioy@xxxxxxxxxxx> fax 212-777-3713