You can send emails from EA when it is making trades quite easily with SendMail() function.
But if you want to email all trading operations from mt4 terminal (open, close, modify orders), then you will need a special EA or script to do that.
I have built such script and can sell it (PM me for details).
The script can work even on accounts accessed by investor (read-only) passwords - like accounts of Participants - Automated Trading Championship 2007

I also have complimentary script, that can make trades from those emails on MT4 (also a program to trade on GAIN Capital and can make such program for any other broker with API). This will be useful for those, who want to sell trading signals and provide their clients with autoexecution ability.

I already mentioned about this in my TradeCopy thread TradeCopy