Debian、Ubuntu终端下邮件配置

exim4+mailutils

    dpkg-reconfigure exim4-config

    Select default options, except:

    mail sent by smarthost; received via SMTP or fetchmail
    mail.mydomain.inc


To test mail agent, need to install a frontend (MUA - mail) to
    exim4:

      apt-get install mailutils
      mail youremail@yourdomain.inc
      (press enter for Cc:, type in subject, press enter)
      (type in body of message, then enter)
      .   (type in single period, then enter, to end composing and email is queued)
      mailq (to see if mail is sent or still in queue)