I agree with you. We have to follow up after sending the resumes/cover letters. But unfortunately, when the person whom we are trying to reach is not available, we leave the message in his/her voice mail system. In most cases the recuiter will not reply to the messages. I understand that the recruiter will not have time to speak to every candidate.
In my case, I tried to reach a recuiter more than 5 times and emailed to him more than 3 times, but there was no response. Moreover,I am sure this recuiter has a requirement that matches my skillset.
I appreciate any comments/suggestions..