You said: >>>> MAIL From:<[log in to unmask]> ><<< 502 No message receipt authorization. >554 <[log in to unmask]>... Remote protocol error Sounds like his incoming mail privileges have been cut off...or his mailbox is full, or he's no longer working there, or any of a number of other reasons why incoming mail would be refused. If he's not authorized to receive messages, you probably ought to NOMAIL him at minimum. Nathan