Postfix安装配置
系统Ubuntu
配置主机名
配置主机名，重要！否则可能出现发邮件解析地址错误发信失败
vim /etc/hosts
127.0.0.1 localhost gitlab
hostname 172.16.15.8
安装包
apt-get install postfix mailutils
Postfix选择Internet Site
主机地址填写本机IP
修改配置文件
vim /etc/postfix/main.cf
myhostname = gitlab
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = gitlab, localhost, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all