Yes, sending emails that are too large can cause problems. By "size" we are talking about the length of the HTML and image size. The issues to be aware of with large emails:
- Impact mobile device download times, impacting user experience
- Emails truncated because of "clipping" (Gmail), impacting the functionality of your email
- And potentially slower delivery of the emails
How to prevent emails being too big?
The best way to decrease your email file size is to compress your images
You can read more from the team at Litmus, here
Related article:
Email size and multipart messages