Hola de nuevo.
A mi no me ha dado ningun problema crear la tabla de usuarios. A
continuacion pongo lo que he hecho.
create table users (
address varchar(255) not null primary key unique,
id varchar(128) not null,
clear varchar(128) not null,
uid smallint(5) unsigned not null default 10000,
gid smallint(5) unsigned not null default 8,
name varchar(128) not null,
home varchar(128) not null default '/var/mail',
domain varchar(128) not null,
maildir varchar(255) not null,
active tinyint(3) unsigned not null default 1
);