Ok, to give a clearer description. My problem ist, that have to send e-mails from a specific domain, in this case leibrecht-consulting.de so it is possible to send for example info@leibrecht-consulting.de but the real domain is hosted on another server, therefor I download with fetchmail the certain mails from this server to the mailboxes hosted on my machine. Some Mailboxes have not been created on my local server so mails to this Mailbox should be directed to the real Mailserver outside. Any Idea how I can reach this goal?