this is an issue a few people are having when using a recordset loop for the to address.
to fix the issue, edit line 68 - 70 of the wasp_newsletter.php page:
$CurIndex = sizeof($RecipArray);
$RecipArray[$CurIndex] = EmailArrayFromFile("WADAwasp_residents.waspEmail");
$TotalEmails += sizeof($RecipArray[$CurIndex]);
to:
$CurIndex = sizeof($RecipArray);
$RecipArray[$CurIndex] = array();
$RecipArray[$CurIndex][] = $row_WADAwasp_residents;
$RecipArray[$CurIndex][] = $WADAwasp_residents;
$RecipArray[$CurIndex][] = "WADAwasp_residents.waspEmail";
$TotalEmails += mysql_num_rows(WADAwasp_residents);