You run your label on your own resources which are almost always scarce. No legal or professional help is available on even the most basic issues. Production without marketing means nothing. Out of 100 submissions, you will probably receive 10 replies. Send everything via regular mail.
Record companies hate registered mail.
If you mail them anything via Express mail, they think you have all the money in the world and don't need them. The people who run the music business have overcome many hardships themselves. They don't want to hear your personal problems, problems in the band etc. Be positive and act positive. If you won't, they won't.