Some people designing email campaigns tend to over-due it. How? They design their campaigns around images. Make your email readable without images enabled – For privacy reasons, most email clients like Outlook, Google as examples, disable images unless the user allows it.
Because of this, any images you include in the email should have descriptive text set for the alternative view. If you have a targeted email list, it’s likely your email recipient will put your email on the safe list so that your email is always delivered as it was intended.