Hello,
I have read carefully what you requested. Based on my experience, I think you do not need to go so deep as C/C++ for having this done. A simple PHP/Python script could do the job.
The software piece you need has two parts: email reader (scraper) & Forex feeder using their API. I would believe you do not need more that just that. I can have this piece of code working in about two days, three days as maximum. Also, I can start to work on this project immediately.
My name is Juan Manuel, and although I am new at Freelancer, am not new as coder. I am a web developer with +25 years de experience. Please take a look to my personal profile for better reference.
Please, give me the chance to create this solution, and after that if you feel that it's fair, give me a good recommendation as professional.
Thanks in advance,
Juan Manuel