The professors are not part of admissions, nor can they suggest anything. Bribery would be hot if such was possible. Unless you have worked with the professor before OR have taken a class with him, e-mailing him won’t help much. It’s also unusual that student who isn’t enrolled is asking Penn staff for work/advice/counseling/etc. Anything conversation between you two is between you two only. The professor, if under contract, may also be unable to publish information about work without approval.
TL;DR: It won’t help you. If you’re working on apps, stop trying to cheat your way in. A recommendation is a lot stronger than mentioning about “e-mailing with a professor”.