Hi D. I know I did not send the complete headers. I sent these earlier to Pat (ref. #107139). I use Netscape Communicator as email program and I know how to view the complete headers. Meanwhile I understood the problem has something to do with the ISP hetnet.nl I sent a separate and numbered (!) message to every list member with hetnet.nl as ISP, in total 22 messages. Short time later I recieved one return message 'nondeliverable mail' concerning a totaly other email address (at hetnet.nl) as "wjkunnen@hetnet.nl". So, indeed an alternate address. I removed this alternate addres from my members list. I hope the problem is solved now. Thanks for the good advise! Don Arnoldus List owner NL-NOORD-HOLLAND --------------- > Hi, > > It could be an alternate address that is being forwarded. You can email > postmaster@hetnet.nl to see if they can help. > > What you posted was not the full headers. The full headers usually have > a dozen or two lines. If you tell use what email program you use, we'll > tell you how to see the full headers. > D. >