ok..i can install dovecot+postfix+MYSQL..etc..and maybe the problem it's resolve. i don't have problem with the machines, the machines are goods, my problem is the tranparent receive e-mails to the users than are distributed in four machines with the same number the users and different users in each. as does google??. they have one entry to e-mail system (gmail.com) but they have several machine (maybe thousands) in transparent mode. i read something like LVS...some comment about this software..! is my solution or I'm lost? Roberto.- -- Roberto Barrientos Molina Administración TIC 207153-207140-207109 UMAG NOTA: Los acentos han sido omitidos intencionalmente.-