配置SMTP发送邮件配置，使用163邮箱。

$ sudo vi /etc/gitlab/gitlab.rb                           
# Change the external_url to the address your users will type in their browserexternal_url 'http://xxhost.com'
#Sending application email via SMTP
gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "smtp.163.com"
gitlab_rails['smtp_port'] = 25
gitlab_rails['smtp_user_name'] = "[email protected]"
gitlab_rails['smtp_password'] = "xxpassword"
gitlab_rails['smtp_domain'] = "163.com"
gitlab_rails['smtp_authentication'] = :login
gitlab_rails['smtp_enable_starttls_auto'] = true
##修改gitlab配置的发信人
gitlab_rails['gitlab_email_from'] = "[email protected]"
user["git_user_email"] = "[email protected]"
（网易服务器smtp机器要求身份验证帐号和发信帐号必须一致，如果用户在发送邮件时，身份验证帐号和发件人帐号是不同的，因此拒绝发送。）

gitlab-ctl reconfigure  配置生效
gitlab-ctl tail  查看相关日志