Using this plugin, you can send email to different users using various SMTP servers with spinning text feature. You can set cron job from cpanel to send email automatically from your server by using this file- your-domain/wp-content/plugins/smtp-cycle-email/cron.php.
There is a publicly accessible web page file which triggers the cron script every 5 minutes. You can use webcron.org or cpanel to set a cron job to simply load the page. The page, when loaded, just grabs the “scheduled” email that is to be sent out and send it out using the next-available SMTP server.