Hi, Timo Sirainen wrote (May 19, 2010 1:50:34 am) : "When a connection from a newly seen user arrives, it gets assigned to a mail server according to a function: host = vhosts[ md5(username) mod vhosts_count ]" This hash function is it still used as it is without modification ? My another question sounds pretty innocent but I have doubts about vhosts_count. Taking two directors with three backend Dovecot as an example, the number of (v)hosts assigned for each host is "100" (default value of the vhost_count variable). I gather that the value for vhosts_count (to perform the modulo operation) and the size or length of the array (vhosts[]) in terms of number of elements are equal to 300. Thx so much. gdrub