Follow the steps.
Locate the E-mail app on your Nexus 7. You can pull the voice search and say “e-mail”. Or just locate the app.
E-mail account: enter the e-mail (email@example.com), enter the password (…).
Incoming server settings:
Notice that all the rows are filled. Modify pop.yourwebsite.com into mail.yourwebsite.com.
Outgoing server settings:
SMTP server: mail.yourwebsite.com
Leave the rest settings as they are.
Next > Next > Next.
To add another e-mail account, check the “ADD ACCOUNT” button on the top of your screen. That button appears when you pull the Settings window.