Landlord will not accept 60 day notice?

My landlord will not accept my 60 day notice to vacate because my wife's signature is photocopied because she no longer lives with me and cannot make it to the office to sign it in person. First question is, is this legal? My other question is that my lease is set to end on July 31 and I plan on giving them a notorized notice on June 2nd. Is this still considered within the 60 day notice period? if it helps any, I am located in the state of Ohio. Thank you in advance for any help.