/**
* Builds the email address of a number.
*
* @param array $number The number and carrier to look up.
* @return string
*/
protected function buildEmail($number)
{
if (!$number['carrier']) {
throw new \InvalidArgumentException('A carrier must be specified if using the E-Mail Driver.');
}
return $number['number'] . '@' . $this->lookupGateway($number['carrier'], $this->outgoingMessage->isMMS());
}
