When a user is sending an e-mail to a particular(external) contact, they are receiving the following message inreturn:The following recipient(s) cannot be reached:person@domain.com on 9/26/2008 9:57 AM You do not have permission to send to this recipient. For assistance, contact your system administrator. <mailserver.com #5.7.1 smtp;554 5.7.1 Filter Rule 16 - Global REJECT Filter Macro 10984>Has anybody seen this before?

Hi Lucky, Are you using any spam filter? Filter Rule 16 - Global REJECT Filter Macro 10984 says that anti-spam is blocking it.

Hi, Please try to contact Mailbox administrator for that external users company and then check whether your Exchange Server has been listed in their RBL or if your Exchange Server has been in their spam list. Besides, you can use the below tool to check whether your mail server has been add to the blacklist. http://www.robtex.com/rbl Hope it helps. Xiu