PHP Mailer Stopped Working


My sites were migrated to a new server this week and since the move the PHP Mailer class has stopped working. I get the following error:

Fatal error: Uncaught exception ‘phpmailerException’ with message 'SMTP Error: Could not connect to SMTP host

My settings are as follows:

$mail->Host = ‘’;
$mail->SMTPAuth = true;
$mail->Port = 587;
$mail->Username = ‘’;
$mail->Password =‘xxxxx’;
$mail->SMTPSecure = ‘tls’;

I have tried port 25 as well as 587.

Before migration this worked fine for several years.

Any suggestions?