They deal with SMTP, which is a quite outdated protocol. Email systems are not designed to transfer large volumes of data. What are the common issues and errors related to email size and how to handle them?Įmail size limits are used for three main reasons:.How do the embedded images affect email size, spam score, and deliverability?.What are the limits of different email clients and sending providers?.What is the recommended size for the email body and attachments?.

In this article, we have gathered replies to the most common related questions: Also, there are some not so obvious factors, which impact the actual email size and deliverability. There are many things you should keep in mind when preparing your email notifications or newsletters: from the maximum size of file attachments and HTML part to the email client your recipients will most likely use. However, there is no unique standard – limits are dictated mostly by performance and security reasons.

Every email sending provider has its own maximum email size limit.

Proton email storage limit