Maximum Email Size Limits You Should Follow
https://mailtrap.io/blog/email-size24.08.2019 · Here are the best practices for building a well-performing email in terms of size: Keep the email body from 15 KB to 100 KB. Don’t add attachments over 10 MB. If possible – upload your files to the external server and make them available online/ for download using a link. Don’t overuse images, GIFs, and other multimedia content.