First of all, these people don't know you, so you can't realistically take a non answer personally. Very often users of online dating services have a stack of profiles next to their PC and take their time returning emails, so don't get discouraged.
The worst mistake you can make is contacting people over and over. This can turn them off and give the impression that you are a stalker, some dating services online will cancel your membership or censure you if they receive reports of continuous attempts to contact ( as well they should. Remember, they don't know your motives any more than you know anyone else's when online.)
Another online dating tip is to contact as many people that have an interesting profile as possible. If you only contact two or three, and then wait weeks for a reply, of course you're going to get frustrated, but if you send contact emails to 20 different people, chances are you will receive several replies. Again, do not take it personally! There are over 100 free online dating sites to choose from, and those are just the free ones.
If you are continuously getting rejection emails (I do not mean no replies, but rather actual rejections) maybe the problem is your profile. Recheck it and see what it says about you. Is it honest and sincere? Did you send your best picture? Does it sound too needy or too non committal? Many dating services online provide help with putting together the perfect profile, and this service is usually free, so take advantage of the sites help windows, and keep trying!
