--- newsletter.orig.php	2020-03-14 12:12:37.000000000 +0100
+++ newsletter.php	2020-03-18 17:17:00.000000000 +0100
@@ -2360,10 +2360,8 @@
 		try
 		{
 			$sendMailCounter = 0;
 			echo JText::_('COM_BWPOSTMAN_NL_SENDING_PROCESS');
-			ob_flush();
-			flush();
 
 			while(1)
 			{
 				$ret = $this->sendMail($fromComponent);
@@ -2638,10 +2636,8 @@
 		if ($fromComponent)
 		{
 			echo "\n<br>{$tblSendMailQueue->recipient} (" .
 				JText::_('COM_BWPOSTMAN_NL_ERROR_SENDING_TRIAL') . ($tblSendMailQueue->trial + 1) . ") ... ";
-			ob_flush();
-			flush();
 		}
 
 		// Get a JMail instance
 		$mailer		= JFactory::getMailer();