コードに中括弧（{}）がありませんでした：
include ("../dbconnect.php");
$sql='SELECT c.endofmonthform, c.startofmonthform, c.email, c.id, c.formlevel, c.mastersite, c.opmanager, u.userEmail FROM `clients` as c LEFT JOIN `users` as u on c.opmanager = u.userName WHERE endofmonthform="22/09/2016"'; //TODAYS DATE BACK HERE!
$result=mysql_query($sql);
while($row=mysql_fetch_array($result)){
$enddate = $row['endofmonthform']; // End
$startdate = $row['startofmonthform']; // Start
$email = $row['email']; //Email to send email to
$id = $row['id'];
$formlevel = $row['formlevel']; //To update and check formlevel
$sitegroupname = $row['mastersite'];
$manager = $row['opmanager'];
$opemail = $row['userEmail'];
/* If end date is today and form level is still ZERO then send email to op manager */
$mail = new EMail;
$mail->Username = 'Sender email';
$mail->Password = 'mypwd';
$mail->SetFrom("[email protected]","companyname");
$mail->ContentType = "text/html";
$mail->Subject = "Client feedback incomplete NEW LAYOUT";
//Enter the email address you wish to send TO (Name is an optional friendly name):
$mail->AddTo($opemail,$manager);
$mail->Message = "<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd >
<html xmlns=http://www.w3.org/1999/xhtml>
<head>
<meta http-equiv=Content-Type content=text/html; charset=utf-8 />
<title></title>
<style type=text/css >
body {margin: 0; padding: 0; min-width: 100%!important;}
.content {width: 100%; max-width: 600px;}
</style>
</head>
<body yahoo bgcolor=#f6f8f1 >
<table width=100% bgcolor=#f6f8f1 border=0 cellpadding=0 cellspacing=0>
<tr>
<td>
<table class=content align=center cellpadding=0 cellspacing=0 border=0 >
<tr>
<td>
ID: ".$id." <br>
Clients group name: ".$sitegroupname." <br>
Managers Name: ".$manager." <br>
Managers Email: ".$useremail." <br>
Please log into your account as you have feedback notifications
<br>
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>";
echo $success = $mail->Send(); //Send the email.
}
また、全体を単純化するためにPHPの一部をクリーンアップしました。注：この問題に関連しないため、電子メールクラスを除外しました。
編集：
TSから、メール部分が機能していないことが通知されたので、デフォルトのphpメーラーを使用してみてください：
<?php
include ("../dbconnect.php");
$sql='SELECT c.endofmonthform, c.startofmonthform, c.email, c.id, c.formlevel, c.mastersite, c.opmanager, u.userEmail FROM `clients` as c LEFT JOIN `users` as u on c.opmanager = u.userName WHERE endofmonthform="22/09/2016"'; //TODAYS DATE BACK HERE!
$result=mysql_query($sql);
while($row=mysql_fetch_array($result)){
$enddate = $row['endofmonthform']; // End
$startdate = $row['startofmonthform']; // Start
$email = $row['email']; //Email to send email to
$id = $row['id'];
$formlevel = $row['formlevel']; //To update and check formlevel
$sitegroupname = $row['mastersite'];
$manager = $row['opmanager'];
$opemail = $row['userEmail'];
mail($opemail, "subject", "message", "from");
}