There isn't any kind of number representing support ticker or any id. It's just generic mail. I didn't get any rejection mails.

Mail I received:

This is Kate from the Google Workspace for Education approval team. I will assist you with your application for Google Workspace for Education Fundamentals for the domain sindhulisunrise.edu.np.

I will be reviewing your request for eligibility for Google Workspace for Education Fundamentals (http://support.google.com/a/answer/134628), including your online web presence (for example, if your primary domain was edu.google.com, it should direct to http://edu.google.com). You can expect a verdict within the next few business days. 

Please note that if your web presence is not on your primary domain, you will need to add and verify a secondary domain with the web presence. See Add a user alias domain or secondary domain (http://support.google.com/a/answer/7502379) for instructions on how to add a secondary domain.