修改/etc/gitlab/gitlab.rb文件
 gitlab_rails['gitlab_email_enabled'] = true
 gitlab_rails['gitlab_email_from'] = '****@mail.com.cn'
 gitlab_rails['smtp_enable'] = true
 gitlab_rails['smtp_address'] = "mail.com.cn"
 gitlab_rails['smtp_port'] = 587
 gitlab_rails['smtp_user_name'] = "username"
 gitlab_rails['smtp_password'] = "passwd11"
 gitlab_rails['smtp_domain'] = "mail.com.cn"
 gitlab_rails['smtp_authentication'] = "login"
 gitlab_rails['smtp_openssl_verify_mode'] = "none"
 gitlab_rails['smtp_enable_starttls_auto'] = false
 gitlab_rails['smtp_tls'] = false
 gitlab_rails['smtp_ssl'] = false
 user['git_user_email'] = ****@mail.com.cn