Martin, Works perfectly for relaying from work machines now. You asked what this had to do with headers...people complain of messages like this: "received at Mon, 19 Jul 1999 21:11:23 +0100 (BST) from mail@wireless-067-118.tele2.co.uk [212.19.67.118] (may be forged)" If anyone knows how to get rid of the MAY BE FORGED part, please do let me know. Patrick