seive.log contains:
Dec 06 21:18:58 lda(ura@infiniteeureka.com): Fatal: setgid(2000 from mail_gid setting) failed with euid=502(vmail), gid=502(vmail), egid=502(vmail): Operation not permitted (This binary should probably be called with process group set to 2000 instead of 502(vmail))
Dec 06 21:23:55 lda(logcheck): Fatal: setgid(2000 from mail_gid setting) failed with euid=488(logcheck), gid=482(logcheck), egid=482(logcheck): Operation not permitted (This binary should probably be called with process group set to 2000 instead of 482(logcheck))
Dec 06 21:28:55 lda(ura@infiniteeureka.com): Fatal: setgid(2000 from mail_gid setting) failed with euid=502(vmail), gid=502(vmail), egid=502(vmail): Operation not permitted (This binary should probably be called with process group set to 2000 instead of 502(vmail))
Dec 06 21:33:55 lda(ura): Fatal: setgid(2000 from mail_gid setting) failed with euid=500(ura), gid=500(ura), egid=500(ura): Operation not permitted (This binary should probably be called with process group set to 2000 instead of 500(ura))