Try using: headers_check_syntax = true headers_checks_fail = true which checks to be sure the From To BCC etc. are correctly formatted and rejects them if not. > > I'm having lots of frozen messages because null sender ie "mail > from:<>" > > I want to reject those email or bounce to one or every header email > address. -- http://www.elbnet.com ELB Internet Service, Inc. Web Design, Computer Consulting, Internet Hosting