Hello, on a server running ISPconfig3 I set up a website (mydomain.com) that uses an external mailserver. On my website I have several webforms that are supposed to deliver their contents to an [email protected] but these mails are not delieverd. When I change the form receiver to an address on a different domain, that is not hosted on this machine, it works fine. So I tried to send an email from a different domain that is hosted on the same server, but I get an error: Requested action not taken: mailbox unavailable 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in local recipient table For my domain (the one with the external mailserver) I had not set up a mail domain in ISPconfig3, so I tried to create one and disable it, but this didn't help either. Receiving mails from domains that are not hosted on this machine works fine. How can I accomplish that emails that are sent from this server are not locally delivered but are sent to the right mailserver (according to the correctly set MX record).
Most likely you used a wrong hostname. ensure that the affected domain is not listed in postfix main.cf and /etc/mailname.
Thank you Till, it was an entry in main.cf, but how did it get there? I'm sure, I didn't put it there and I'm a little concerned about it appearing there again.
