How to keep fit size for image in Email

I am create a emial web page and have few dynimic image in the content. I set size of image to fix value (200px) but when i recieve email. it always keep the original size of image. 
Any idea?

Hi Truong,

How is that you're setting the image to a fixed value?


I set width & height value for Image widget. 
Can you attach your code (oml), so that I can take a look?