I setup this plugin but what ever i do in the setting for

I setup this plugin but what ever i do in the setting for the SMPT the plugin will not send e-mails, everthing is setup correctly and ports are open.
As tried using an gmail account and it still does not work.
Message said e-mail setting are not correct or ports are blocked.
I have contacted my hoist provider and they state that all the ports are open.
I have tried Gmail account and also two different e-mail address and setting, but still it does not work

Need some help with this