Dear sir
Hi ,
I'm living in Iran and wants to use "Sell Online" on my web sites to sell my products online and receive its money (earned via eshopping) by cheque ,
Some gateway american companies have no services for Iran ,
Can you tell me some company that support Iran ?

Best and kindest regards

Not here, fellow.

I don't know of any but you might try the following websites, all of which address ecommerce to varying degrees.

Good luck.

http://www.ecommercetimes.com/
http://www.ecommerce-guide.com/
http://www.clickz.com/