Dear Sir or Madam
Here are some tips on cultural literacy in Iran, as I know you want to come on a business trip here. I think these tips are useful for you.
About table manner, it’s offensive to speak when your mouth is full. You should eat with spoon and fork, you shouldn’t eat your food with your hands.
Its taboo here to order pork, because most of people are Muslim and they don’t eat it.
It’s impolite to call someone by his or her first name; in formal places you should call them with their last name.
Punctuality is very important in meetings and it’s impolite to arrive late.
I hope these items help you on your business trip to Iran. Have a good place, and don’t forget to visit our historical places.