You cannot take a picture using the Camera and send the resulting image in an eMail using only App Inventor 2 Blocks. There is no way to send an eMail with an attachment (your picture) using just Blocks.
You might be able to send the eMail with a picture using one of the methods listed on Taifun’s web page
eMail Solutions
Some of these email options are free, others are paid and other’s use servers. These are created by third party developers and are not endorsed by App Inventor 2.
These links contain information that might help you to do what you want to do with the Camera
Save Camera Pictures with Custom Names (Variables)
and