Rainer Traut wrote: > No NIS or LDAP, plain local files. I haven't tried CentOS 5.2 yet(keep seeing reports of issues), postfix in 5.1 worked fine for me and in 4.x. I suggest just adding the group manually and removing/re-installing the postfix rpm. Perhaps there is a bug in the 5.2 RPM that doesn't add the group correctly for some reason. What I'd probably do is just copy/paste the postdrop entry from the other system's /etc/group file to the system that doesn't have it. I use the same password/group/shadow files across CentOS 4, 5, and FC8 (and in the past FC4, and FC5) so the UIDs/GIDs are pretty compatible. nate