This is quite tricky in terms of you do not want to email someone so much that you end up annoying them. At the same time you don’t want to be in the position that they forget who you are. One of my first TV presenting jobs was for a company called Wedding TV – I used to email the executive producer there roughly every 8 weeks saying if there were any jobs going BUT most importantly I would send him a new showreel or just simply update him with my progress.