How should I email a previous employer to pass my resume to HR?

Hi everyone,

So currently there's a position I'm interested in at a company that I had an internship with. Now the problem is that, that internship was 4 years ago and I never kept in touch with the VP or MD. They did like me at the time and offered me a full time position after graduation but I declined because I wanted to get an accounting internship the following summer(yeah I know dumb move), which did not happen.

Anyways the past is the past and I can't do anything about that, back to this position that I'm interested in. I know my best bet to even get an interview is if they pass my resume along instead of me applying directly online, but I can't quite put my finger on how to approach them without sounding like a total user. Please Advise!