I am currently using SwiftMailer SMTP to send a large number (around 4000 addresses) of emails using BCC with an application Im developing with PHP, but I keep getting this error
Fatal error: Uncaught exception 'Swift_TransportException' with message 'Expected response code 250 but got code "554", with message "554 Too many nonmail commands "' in /home/childsur/public_html/plugins/swiftmail/lib/classes/Swift/Transport/AbstractSmtpTransport.php:386
What does this error means and how can it be rectified?
Thanks in advance