When email clients or a single person disables the automatic loading of photos in an email, this is known as image blocking. This is done for a variety of reasons, the most important of which being security for email clients, and bandwidth for users.
Images are automatically banned due to a default option in the email client or the recipient’s personal preference. They save time and data, but marketers are unable to communicate effectively as a result of this. One of the main reasons that mass email senders choose simple emails is that images are blocked.