1. 编辑/etc/gitlab/gitlab.rb文件（加到文件最后面就好了）。以QQ企业邮箱为例：
gitlab_rails['smtp_enable'] = true gitlab_rails['smtp_address'] = "smtp.exmail.qq.com" gitlab_rails['smtp_port'] = 465 gitlab_rails['smtp_user_name'] = "ala.it@alaven.com" gitlab_rails['smtp_password'] = "Alad111222" gitlab_rails['smtp_domain'] = "alaven.com" gitlab_rails['smtp_authentication'] = "login" gitlab_rails['smtp_enable_starttls_auto'] = true gitlab_rails['smtp_tls'] = true gitlab_rails['gitlab_email_from'] = 'ala.it@alaven.com'
有的教程可能会说去改/opt/gitlab/etc/gitlab.rb，是错的，一切以官网文档为准
2. 重新配置gitlab
gitlab-ctl reconfigure
3. 通过命令行测试邮件是否发送成功（也可以不测）
gitlab-rails console
irb(main):003:0> Notify.test_email('123456789@qq.com', 'Message Subject', 'Message Body').deliver_now