Why do I get a "Permission Denied" error when I use the SMTP connection?
This is more than likely die to a firewall rule that has been put in place by your hosting provider. Though I have not verified this information I have also been informed that PhpSuExec can cuase problems establishing socket connections.
The error comes from fsockopen(), not from Swift directly. You should contact your hosting provider for further help.
The following link may be of interest:
