SendGrid email provider returns timeout error on paid SaaS version

Hello everyone!
I have a question about the email providers in Casdoor. We have tried out the self-hosted version of Casdoor, and the email provider worked perfectly, but when we've used the paid version of casdoor, the email provider (SendGrid) didn't work, the "test smtp connection" button returns a timeout error message (with the ip address of smtp.sendgrid.net). Do you know what could cause the problem?

@hsluoyz wow, thank you very much, i saw your commit, it works now with v1.595 with the new sendgrid provider!!!!!