I configured with --with-mail-gid=12

sendmail.cf says: # default UID (can be username or userid:groupid) O DefaultUser=8:12

yet my mail log is saying Dec 22 12:12:33 ruby32 Mailman mail-wrapper: Failure to exec script. WANTED gid 12, GOT gid 65535. (Reconfigure to take 65535?)

when mail is sent to the server

any ideas why sendmail isn't throwing the expected GID?

Thanks