Servidor de e-mail postfix para Ubuntu
POSTFIX
Postfix é o Mail Transfer Agent (MTA) padrão do Ubuntu. Ele tenta ser rápido, fácil de administrar e seguro. Este tutorial explica como instalar e configurar o postfix.
Abra o console do ubuntu e execute o comando abaixo para logar como usuário root e ter as permições necessárias: sudo -s -H
Executando esse comando irá pedir senha de usuário root, digitado a senha você terá as permissões necessárias para modificar, instalar, etc.
Antes de começar a instalação troque a sua source list, para que todos os pacotes para instalação estejam disponíveis: sudo gedit /etc/apt/sources.list
Abrirá o arquivo sources.list, então substitua pela nova source list abaixo:
########## # # # # # Offical Ubuntu # # # # # ########## deb http://us.archive.ubuntu.com/ubuntu/ intrepid main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid main restricted deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted deb http://us.archive.ubuntu.com/ubuntu/ intrepid universe deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid universe deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates universe deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates universe deb http://us.archive.ubuntu.com/ubuntu/ intrepid multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid multiverse deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates multiverse deb http://us.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse deb http://us.archive.ubuntu.com/ubuntu/ intrepid-security main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-security main restricted deb http://us.archive.ubuntu.com/ubuntu/