Moving your mail from another provider
What comes across, what cannot, and the one thing to do before we start.
Add a mailbox to a plan that is full
You do not have to move to a bigger plan. One more mailbox costs one mailbox.
Set up email on your own domain
The records that make it work, and the two that decide whether anyone receives it.
WordPress is not sending email
Not a fault. A fresh WordPress has no way to send mail until you give it one.