WordPress Mail not sent through SparkPost

I did everything. Verified domain. Setup API with SMTP permissions and Transmission: Read/Write checked. Installed the plugin, enabled to send via sparkpost, input my API, selected SMTP 587 for method. Verified my firewall isn’t blocking SMTP 587. Test Email wont send, and wordpress emails wont go through SP. SparkPost can’t help, GoDaddy can’t help. Anyone out there who can ?