Hi I am using debian 5.0.6 and ispconfig 3 I have a mail domain set up, if I send an email to an invalid alias I get an immediate 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table I have an domain alias set up that points to the mail domain, if I send an email to an invalid alias I get a 250 2.1.5 Ok Is it possible to get domain aliases to also reject with a 550 at the SMTP stage as well as the primary domain? Kind Regards Paul