i can not send to a specify customer email address , no NDR Response , but Customer always can not receive our mail i use exchange message Tracking Center, it show relay and transport ok check firewall and spam it's no problem is any idea how to trace this problem ps: it's ok when use external Mailbox like hotmail

Hi Have you checked your ip adress that sends the mails so it's not blacklisted? You can do that on www.mxtoolbox.com Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

On Thu, 15 Jul 2010 07:45:09 +0000, lowenfu wrote: > > >i can not send to a specify customer email address , no NDR Response , but Customer always can not receive our mail > >i use exchange message Tracking Center, it show relay and transport ok > >check firewall and spam it's no problem > >is any idea how to trace this problem If your SMTP protocol log shows that the message was successfully sent to the other domain then it's up to their admins to figure out where the mail's gone. From what you describe, it sounds like it's been swallowed by their spam filter. >ps: it's ok when use external Mailbox like hotmail --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Did you check recipient Junk mailbox and other folder. you can also try to send mail using SMTP command and see if any error like "IP mismatch" getting. As above said by Rich, Also check whether you are blocked as spam for remote domain.Anil