GIDs should follow the "system user/group convention" and be lower than 1000
Some GIDs from groups created during Plesk installation are higher than the conventional value (1000):
psaadm:x:997:1001
dovecot:x:995:1005
dovenull:x:994:1006
roundcube_sysuser:x:993:1007
psaftp:x:991:1008
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