You can recall an email in your iPhone's Mail app. Here's how to set it up.
https://www.cnet.com/tech/services-and-software/send-an-accidental-email-heres-how-to-unsend-it-on-your-iphone/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e
https://www.cnet.com/tech/services-and-software/send-an-accidental-email-heres-how-to-unsend-it-on-your-iphone/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e