What everyone else said. Even if you do get Mike Carens (Google him) email itll be underneath a lot of other crap and may never even get opened. Go to where they are, communicate via social networks. Work with as many artist as you can making FULL projects not let me get 1 beat here and there.
I've recently had 3 A&Rs follow me (Shady Records, Interscope & Bad Boy) on twitter. Why? Well I tweet a lot about the business of the music industry, tips on mixing to help producers, marketing tips, tips for artists and a whole sort of things as well as my own music. I just promote a lot and talk to people all over the globe literally. That being said, if your music is that good they will find you. Stop searching for them. What can they offer you that you can make for yourself? Getting signed? & getting almost 75% of your publishing stolen from you? If thats what you want then by all means go ahead.
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OH I forgot. lol Network! I recently got the opp. to engineer for one of Lil Scrappys Artist and he ended up using one of MY BEATS for that session because I knew someone. He needed studio time.
Another time I collected an email from an artist on twitter & emailed and he hit me back & loved my work. He used one of my records for a mixtape he did. This was an artist in Zaytovens Camp. He has even shouted me out in the same sentence as Zaytoven so that meant a lot to me. lol
Another instance (my favorite) was when I heard my record in itunes and had no idea! The arist name is Ice Berg, reallly big artist in Florida, major in Miami. he's done work with ace hood, trick daddy, billy blue, brisco etc...
Any way I was going through his mixtape (2 months after it dropped, I had never finished listening to it) and I heard a sample I had chopped up before. As I was listening i was like wow i sampled this the same way...Then I heard my Tag.. I was like oOOOOO SHh********!!!!!! hahha. .lol i was so excited, I had no idea. I never recieved a notification. & it was an older tag i never used that often. I sent him that beat full(idk why) along time ago and never heard from him. Just send & forget.
I contacted him & he was like whats good, send me more material. So ive connected w/ him. Just have to put in that work.