Know all the steps to cancel send email in Gmail and fix your issues instantly.
Step 1: Turn on Undo Send
Step 2: open Gmail
Step 3: In the top right, click Settings
Step 4: In the Undo Send section, check the box next to "Enable Undo Send
Step 5: Set the amount of time
If still, you have any kinds of issues then visit here
https://gmailhelpsblog.wordpress.com/2018/01/12/how-are-you-supposed-to-cancel-send-emails-in-gmail
