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I want to send group messages using send grid. My group have 100 members.When I send a group message, 50 to 80 messages are delivered and then it shows a blank page as: NetworkError: 500 Internal Server Error My Code is, set_time_limit (0); $usernames = 'username'; // Must be changed to your username $passwords = 'password'; // Must be changed to your password // Create new swift connection and authenticate $transport = Swift_SmtpTransport::newInstance('smtp.sendgrid.net', 25); $transport ->setUsername($usernames); $transport ->setPassword($passwords); $swift = Swift_Mailer::newInstance($transport); // Create a message (subject) $message = new Swift_Message($subject); // add SMTPAPI header to the message $headers = $message->getHeaders(); $headers->addTextHeader('X-SMTPAPI', $hdr->asJSON()); // attach the body of the email $message->setFrom($from); $message->setBody($html, 'text/html'); $message->setTo($to); $message->addPart($text, 'text/plain'); if ($recipients = $swift->send($message,$failures)){ $message= 'Message sent'; }else{ $message= "Something went wrong - message not sent, please try later"; } asJSON: { "to": [ "" ], "sub": { "-name-": [ "anu" ], "-time-": [ "12 PM" ] }, "category": "initial", "filters": { "footer": { "settings": { "enable": 1, "text\/plain": "Thank you " } } } }

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