Hello, I upgraded my server from Ubuntu 11.04 to Ubuntu 11.10 I was also looking around on the forums to see if someone had the same issue. They didn't have the same issue but there were similar ones regarding postfix screwing up. I can receive email from outside but I can't send email to others in the domain or on other domains. When I go to send an email it asks for my password which I type in and then it asks again. After a couple times it fails out with the following image. I ruled out invalid password as I have always used this password. I've ruled out ports being blocked as I have checked my router and the server firewall port 25 is allowed through. If anyone could shed some like it would be greatly appreciated.