How do I change the temporary printer email address to an easier one to remember?
You can change the printer's email address from the temporary one, but there are some limitations. As you will see on the page linked below, the @ can't be used in the address name and some characters are permitted.
Support page: https://www.epsonconnect.com/help/en/html/email_3.htm
Limitations:
You cannot copy the email address and paste it in the box. The following restrictions apply when entering an email address. You must enter more than 6 characters and less than 32 characters. You can only use alphanumeric characters and single-character symbols (!#$%&i*+-/=?^_`{│}i.). You can use upper-case and lower-case characters. You cannot use “@”.
You cannot copy the email address and paste it in the box. The following restrictions apply when entering an email address.