I had the same issue.
Ended up modifying /includes/class.phpmailer.php as follows:
Changed function AddAddress($address, $name = '') (line 407?) to the following:
Code:
public function AddAddress($address, $name = '') {
$b = true;
if (strpos($address, ",") >= 0) {
$a = explode(",", $address);
foreach ($a as $value) {
$b = $this->AddAnAddress('to', trim($value), "");
if(!$b){return false;}
}
} elseif (strpos($address, ";") >= 0) {
$a = explode(";", $address);
foreach ($a as $value) {
$b = $this->AddAnAddress('to', trim($value), "");
if(!$b){return false;}
}
} else {
return $this->AddAnAddress('to', $address, $name);
}
return $b;
}
Please excuse my coding - I'm not a native php developer.
(Basically this allows you to specify a comma or semicolon delimited email list)