Try deleting these lines:
$Email->ReplyTo = "".($rsMemClub->getColumnVal("MemEmail")) ."";
$Email->ReturnPath = "".($rsMemClub->getColumnVal("MemEmail")) ."";
$Email->BurstSize = "200";
$Email->BurstTime = "1";
$Email->WaitTime = "1";
Return path should never be set to the same email address as the TO... return path is the email address to send to when the email fails, so you can't send a fail message to the address that failed.
Reply to also makes no sense as the TO address. The other lines are not needed for a single email.
After making those changes try again and let me know.
The next step would be to remove the BCC. Then maybe hard code the TO and FROM to see if it works when it isn't coming from the database. You will have to narrow down what is causing the issue so it can be solved.
