void AddAddresses (Header header, InternetAddressList list)
{
int length = header.RawValue.Length;
List<InternetAddress> parsed;
int index = 0;
// parse the addresses in the new header and add them to our address list
if (!InternetAddressList.TryParse (Headers.Options, header.RawValue, ref index, length, false, false, out parsed))
return;
list.Changed -= InternetAddressListChanged;
list.AddRange (parsed);
list.Changed += InternetAddressListChanged;
}