Support Topics: Email: Troubleshooting: People trying to e-mail me are getting over quota bounceback e-mails
The most common reason the sender would receive a bounceback message when trying to e-mail you is if your e-mail box is over quota. You can check your quota usage by logging into our webmail system. If your account is over quota, you can delete messages off the server through the webmail interface to free up space.
If you are receiving a bounceback e-mail other than an over quota message, please look here.