After changing the mailbox, the editorial department asked to send a confirmation email. How to send?

After changing the mailbox, the editorial department asked to send a confirmation email. If you want to contribute by email, please log in to your email address, such as QQ email address, click Write, enter the email address of the editorial department, click Add Attachment button, upload your email, and then click Send button. If the editorial department asks you to enter your name, address, etc. , you can write in the text area.