The reason email header size is crucial is that it can affect how your email is displayed on different devices. If your header is too large, it might get cut off on smaller screens, like smartphones, which could lead to a poor user experience. On the other hand, a well-designed header that's proportionate to the rest of the email can make your message look polished and professional.
Think of it like planning a dinner party - you want to make sure the decorations, food, and music all work together in harmony. In the same way, a balanced email design, including a reasonable header size, can create a cozy and inviting atmosphere for your readers. By keeping your header size in check, you can avoid overwhelming your guests (or readers) and make them feel more comfortable.
A good rule of thumb is to keep your email header size under 100px - that way, you can ensure that your message is displayed correctly on most devices. Mailchimp even provides templates and design tools to help you create stunning emails with proportionate headers. By using these resources, you can create an email that looks amazing and is effective in getting your message across.
Email Header Dimensions Mailchimp at Ernest Stockton blog
