Yes, if your application uses a service like SendGrid or Mailchimp to send emails through their API. Ports 25, 465, and 587 (standard SMTP ports) are blocked at Kinsta because we do not provide email hosting services. For examples of how to set up an application to send emails through a third-party email service, check out these quick start guides:
Set Up a Node.js Application To Send Emails on Kinsta
Set Up a PHP Application To Send Emails on Kinsta