To make sure that not just anybody can send SMS's with your account, you need to authorize all E-mail adresses that are allowed to send messages.
In your Email to SMS screen, go to Settings > General and scroll down to the bottom of the screen. There you can add E-mail adresses that are allowed to use the Email to SMS service.
If you wish to whitelist an entire domain, you can send us an email at support@ringring.be
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