Here are Easy Formats of Email. You can use these samples if u want to let your candidate know that you are not able for this post. Necessary changes can be done.

Sorry Email for Candidate Rejection

To: Mr John

From: Mr Phoenix

Dear Candidate,

We are writing this e-mail to inform you that we have selected another candidate for the Marketing Associate position. Your resume well built and impressive as well but we have felt that you are not right for this particular job in our company. We really appreciate your effort for a job but we would suggest you first to get some experience regarding field by internship. We wish you very best luck for the future.

Regards,

To: Mr Joaquin

From: Mr Ledger

Dear Candidate,

Thank you very much for your interest in our company. You were on hold after your first interview with our company and it is to inform you that we have selected another candidate for the next interview. He had Masters in particular field while you only had bachelors so on basis of merit and experience, we have done this selection. We appreciate you for investing time with our company. We wish you the very best for your future endeavors.  

Dear Candidate,

This email is to inform you that you have been rejected for the  HR position in our company. We appreciate your efforts in providing all the applications and documents to us on time. We are looking for someone to give proper full-timing to the job and as you are doing your Masters we are afraid that you will be giving all the attention to the work as it is required. Best of luck for the future. Thank you for applying.

Regards,

Dear Candidate,

This email is to inform you that you applied for a certain position in our firm. It is to tell you that there are other several candidates we have interviewed and their experience in this field is far more than yours. Other candidates also fall in fulfilling the requirements of the given job. You have not been selected for this position. You are welcome to apply again in the future with more experience in your hands

Regards,