OpenSSL::SSL::SSLError: hostname was not match with the server certificate

Gitlab配置邮件发送服务后总是收不到邮件，检查/var/log/mail.log，表现行为为连接TLS然后断开，检查Gitlab/log/sidekiq.log说OpenSSL::SSL::SSLError does not match the server certificate

解决方案为: 不要验证了

An infinitely better solution (in terms of security that is) than the accepted answer would be:

ActionMailer::Base.smtp_settings = {
  :address              => "mail.foo.com",
  :port                 => 587,
  :domain               => "foo.com",
  :user_name            => "[email protected]",
  :password             => "foofoo",
  :authentication       => "plain",
  :enable_starttls_auto => true,
  :openssl_verify_mode  => 'none'
}
This way you'll still be using encryption, but the validation of the certificate would be disabled (and you won't be getting any errors).

参考

http://stackoverflow.com/questions/4505795/rails-3-opensslsslsslerror-hostname-was-not-match-with-the-server-certific