There are many reasons why you may have regular payments to make overseas :
general living expenses
Often these payments go through a bank. Banks charge a premium for sending money overseas, while dedicated international money transfer companies offer a quicker service for less.
OFX and TorFX offer their clients recurring transfers. They are regulated as a bank, so your money is safe. Once set up with your account manager you have nothing to worry about. The payment is made automatically at the specified dates using the best rates available.
Currencies fluctuate and exchange rates change all the time. Obviously this effects your currency exchange.Good money transfer companies search for the best rates available. If your transfer is not urgent some currency transfer companies offer options to wait for and profit from better rates.
All transfers incur a charge by the company managing the transfer and this varies between transfer companies, Dedicated transfer companies are a lot cheaper than banks.
The exchange rate can make a large difference to your financial transfer and your wallet!