From a legal point of view they are no swindlers, but from my personal view they are. Just read everything of this topic, follow my advises, suggestions, remember my information, print it out or come back now and then, but visit also my recommended resources, including my recommendations to provide yourself with tools or services that are created by professionals.
Now you probably ask yourself 'what can you do for me? Well that is very simple, I want to protect you for any kind of possible scam. , no, just for the simple reason I can't verify every step you make, but 'can I do this myself? 'Oh, you want to sell me something', certainly not in the first place, the information in our website could be sufficient for you, if you just use your common sense and normal knowledge of human character, keep both feet on ground and if you are not too credulous, then it's already a start.
Try to find out if her letters to you are very personal and don't look like standard generated letters.
Persons who are just trying to get your money are using pre-defined letters, just because they don't have the time to write each person in a personal way.
Only use real, professional and verifiable agencies.
Check the agency If you visit the website of some Dating Agency, try to read all the information about this website before you start to browse through the ad's.
This is at least a sign that you have to be careful.
Ask specific questions and check if you receive answers on these questions In case you are using an Agency with email forwarding or other mail-services, and your correspondent is not responding on your specific personal questions, this could be a sign of being suspicious.
Another important thing is to confirm with her if your (original) letters indeed are reaching her.
Do not use any free dating site where women can contact you first. Any person can signup here complete anonymous (use any free email address and fake personal information).
Even when you have to pay to be a member (for receiving emails) on these free dating sites, don't use it if you are serious in looking for a new life partner.