In ISPConfig3 in a multiserver environment, "mailserver1.example.com" has been defined as the default mailserver for a client. That client has also a maildomain on "mailserver2.example.com" instead on the default mailserver. After creating a mailbox/email address for the client on mailserver2.example.com, the "Welcome to your email account from ISPConfig3" has not been sent to the mailbox on mailserver2.example.com. ISPConfig3 sents it to the default mailserver of the client instead. I've also noticed that the client can login with RoundCube with his new email account on mailserver1.example.com AND mailserver2.example.com as well. Then i found out that the "Welcome to your email account from ISPConfig3" has been sent to his account on mailserver1.example.com and not mailserver2.example.com as it should be. (The mailbox is in the vmail directory on host mailserver2.example.com, which is correct) My two questions are: - Why is the client able to logon on mailserver1.example.com AND mailserver2.example.com (with the same email account) - Why sents ISPConfig3 the Welcome email to the wrong host.