Although you may not believe it, the measurement of the images in your newsletter is really important when you are creating your email marketing newsletter. It is important that they have the right measurements because if they don’t, your newsletter may become distorted because of your newsletter’s images.
The largest size your image should be is about 600 pixels and should weight 200kb. You are advised to import the image exactly how you want it to appear in your newsletter, so that it does not bring problems. You can use programs like Photoshop, Photopaint or you can find some free ones on the web that can help you edit you’re your images before importing them into your account.
Do not go change the size or weight of HTML code, since the weight of the file will not change.