Alright, 3 times now I've set up an ispconfig server using the perfect setup guide on ubuntu dapper drake. And all 3 times, my users cannot send email to anybody but localhost. They always get the error: Relay access denied to: ____@_____.___. What should I do? I want to enable my users to send emails to any email address, so its just like any other email provider. Thanks!
Just enable SMTP-Authentication in your email client. In outlook the checkbox to enable this is named "Server requires authentication".
