There are several reasons why images may not be displaying in your email. Here are some common reasons:

• The images are blocked by the email client: Some email clients block images by default for security reasons. The recipient may need to manually allow images to be displayed.
  
• The images are too large: Large images may take a long time to load or may not load at all, depending on the recipient’s internet speed and email client. It’s best to optimize images for the web and keep their size below 1 MB.
  
• The images are not properly embedded: Make sure that the images are properly embedded in the email and not linked externally. If the images are linked externally, they may not display if the recipient’s email client blocks external content.
  
• The images are in an unsupported format: Different email clients support different image formats. Make sure that the images are in a widely supported format such as JPEG, PNG or GIF.
  
• The images are hosted on an unsecure server: Some email clients may block images that are hosted on unsecured servers. Make sure that the images are hosted on a secure server with an HTTPS connection.
  
• The email client is experiencing technical issues: Occasionally, email clients experience technical issues that prevent images from loading. In this case, the problem should resolve itself after some time.

What type of images can be used in an email?

There are several types of images that can be used in an email. Here are some of the most common types:

• JPEG (Joint Photographic Experts Group): JPEG images are widely used for photographs and complex images. They can be compressed to reduce file size but may lose some image quality in the process.

• PNG (Portable Network Graphics): PNG images are used for images with transparent backgrounds or images that require a high level of detail, such as logos or icons. They support lossless compression, which means that the image quality is not compromised when compressed.

• GIF (Graphics Interchange Format): GIF images are commonly used for animations or simple graphics. They support animation and transparency, but have a limited colour range and may appear pixelated for more complex images.

• SVG (Scalable Vector Graphics): SVG images are used for vector graphics, such as logos or icons. They are resolution-independent, which means that they can be scaled up or down without losing quality.