My understanding of your question is that your resume has passed the examination, and now you have received the confirmation letter or interview letter from the recruiter.

If so, then

For the confirmation letter automatically replied by the system, such as "Our company has received your application letter. Thank you very much for applying for our company. If necessary after the review, we will inform you to conduct an interview. " Such a confirmation letter needs no reply.

In the interview letter to the recruiter HR, first thank the other party, then confirm that you will attend the interview on time, and finally thank you!

In fact, you can supplement your question in more detail. I hope my answer is helpful to you.