Gitlab SMTP发送邮件报错 Net OpenTimeout execution expired

Gitlab SMTP发送邮件报错：

Net::OpenTimeout: execution expired

查看Gitlab发送邮件日志：

# tail -f log/sidekiq.log

原因：阿里云服务器默认是屏蔽25端口，采用SSL 465端口发送即可

SMTP远程服务器端口测试：

# telnet smtp.exmail.qq.com 25  //不通
Trying 163.177.72.143...
^C
# telnet smtp.exmail.qq.com 465  //通
Trying 163.177.72.143...
Connected to smtp.exmail.qq.com.
Escape character is '^]'.
^C
Connection closed by foreign host.
#

# sudo -u git -H vim config/initializers/smtp_settings.rb
# sudo -u git service gitlab restart

if Rails.env.production?
  Rails.application.config.action_mailer.delivery_method = :smtp

  ActionMailer::Base.delivery_method = :smtp
  ActionMailer::Base.smtp_settings = {
    address: "smtp.exmail.qq.com",
    port: 465,
    ssl: true,
    user_name: "example@example.com",
    password: "123456",
    domain: "mail.example.com",
    authentication: :login,
    enable_starttls_auto: true,
    openssl_verify_mode: 'none'
    # openssl_verify_mode: 'peer' # See ActionMailer documentation for other possible options
  }
end