Exceeding the included messages for your plan does not
prevent you from sending or receiving additional messages. Instead, message overages are automatically billed to your account at the end of each month.
When it is detected that your account is likely to exceed the included inbound or outbound messages for your plan, you will receive a notice that includes the projected overage amount, based on your average daily usage.
You can monitor your inbound or outbound message volume from the dashboard of the control panel:
Increase included messages
You can also subscribe to higher included inbound or outbound messages from within the control panel:
Inbound included messages
Outbound included messages
Billing spike protection
We also provide protection from overage billing spikes that are caused by unexpected or unusual increases in message traffic.
For details on claiming this protection, see: Free protection from overage billing spikes
Outbound billing exemptions
There are also some situations where mail is not included in your outbound message count.
See: How are the Outbound Message overages counted?