src/Mailtrap.php
static function sortEmailsByCreationDatePredicate($emailA, $emailB) 
  {
    $sortKeyA = $emailA->sent_at;
    $sortKeyB = $emailB->sent_at;
    return ($sortKeyA > $sortKeyB) ? -1 : 1;
  }
static function sortEmailsByCreationDatePredicate($emailA, $emailB) 
  {
    $sortKeyA = $emailA->sent_at;
    $sortKeyB = $emailB->sent_at;
    return ($sortKeyA > $sortKeyB) ? -1 : 1;
  }
Get Email To

Returns the string containing the persons included in the To field

@param mixed $emailA Email
@param mixed $emailB Email
@return int Which email should go first