Hello.
I would like to continue and develop the topic of sending a letter to an email via 3G shield. Interested in this topic. I stumbled upon a project where the author transmits with the help of sim5320 to an email not just text, but first takes a photo with the camera VC0706, and then sends it with the attached photo. In short: this is an email camera. I think someone else might be interested too.
Link: https://www.instructables.com/id/Email-Camera-VC0706-3G-Shield-Arduino-M0-Analogue/