On May 23, 2009, at 9:14 AM, Roy Sigurd Karlsbakk wrote: > deliver(roy at somedomain.com): 2009-05-23 15:02:52 Fatal: setgid(115) > failed with euid=115, gid=114, egid=114: Operation not permitted You start deliver with wrong group (114 instead of 115). What does your Postfix configuration for deliver look like?