Well, Chapter 39 does warn me that using deliver in a system filter will change the envelope - and so it does. But I can''t see how to modify it. I have a system filter which says if $header_from: contains @adelix.com and $header_to: contains @adelix.com then unseen deliver someplace.else endif This works - and the mail is delivered normally as well as at someplace else. However, the search when using someplace.else''s facilities is a bit skewed because the envelope is skewed. Is there a better way I can do this? From reading chapter 39, I can''t see how. Regards Neil ------------------------------------------------------------------------------------ Scanned for viruses, spam and offensive content by CensorNet MailSafe Professional Web & E-mail Filtering from www.censornet.com