# Automatic default originator

Since the SMS API can send to a global audience, it is sometimes best to leave the `from` parameter blank. This is because your account can be configured to use a *pool* of default originators. If configured, the API automatically selects the most appropriate "sending" phone number on your account. It's not an automatic setting, but your account manager can help you get set up.

Once set up, the API automatically populates the `from` field with the best number (default originator) for each respective country. It will be used when a batch message has no originator specified (when it's missing the `from` parameter).

For each phone number (MSISDN), the originator will be auto selected from its default originator pool based on the country/region of the phone number. In this way, a batch with multiple recipients from varying countries can end up with different originators.

If no default originator exists for the target phone number, then the message will fail only for *that* number. The rest of the batch will be sent.