Excuse me for repeat this question but I don't mind how to do this in qmail. I have one domain domain.com and two machines (AAA and BBB), AAA receives mail to [EMAIL PROTECTED] and depending on the user forward it to [EMAIL PROTECTED] in BBB. I try with: * With smtproutes all the mails at domain.com is forwarded to BBB. * With fastforward + Virtual Domains: I received a mail in AAA to domain.com, if the name is in the aliases file I change domain.com to a virtual domain in AAA (leaving the mail in AAA) , but how can I do a forward to BBB if that user is not in the aliases at AAA??? Thank You again. Sebastian Wain ps: Why I have to do this? I have and Exchange server running on NT serving thousands of email addresses and I have to migrate smoothly to Unix, since this is very critic the two systems must cooperate and share the same domain.