Replying to all resumes would be the polite thing to do, but often it simply isn't practical. If a company receives 200 responses for an ad, or experiences a continual deluge of unsolicited resumes, it would spend an inordinate amount of time sending acknowledgments. If you really want a receipt for your resume, send a stamped, self-addressed postcard asking for one. If you make it easy, the human resources department will comply.

People can be unreliable and disloyal; possessions can lose their value; jobs that once stimulated you can become boring. But principles remain steady through it all.
Nido Qubein

It is easier to do a job right than to explain why you didn't
Martin Van Buren