Hey there Fletch815,
Thanks for reaching out to Apple Support Communities. We understand that photos are blurry when you email them. We're happy to provide some assistance.
When you attach the photo to the email, you see the option to adjust the size of the photo from Small, Medium, Large, or Actual Size. Try choosing Actual Size. This will provide you the highest quality of the image.
If the issue persists, does this occur with all recipients or specific recipients? Does this occur with all images or specific images? Was this image taken from your iPhone? This will help us determine how to proceed.
Have a great day!