If you change your email address you will need to update your TextMagic account. First log in to your TextMagic account and then click on Email to SMS in the left hand column.

You may also need to update how you receive Balance Alerts.

If you use MagicMessage you may need to update your reply email address.  Click on tools, account details. If the reply email address field is left blank then replies will be sent to the primary email address for your account.