With this plugin, you can send auto slack invitation via email to user who submitted a gravity form.
Gravity ExtendPlugins for Gravity Forms
Gravity ExtendEnable users to automate and manage form-based business processes efficiently. These plugins allow creation of custom, multi-step workflows with conditional logic, approvals, assignments, and review loops, all configured through intuitive drag-and-drop interfaces. They support integrations with external services and applications, enabling expanded automation across platforms such as WooCommerce, Zapier, and various email marketing tools.
With this plugin, you can send auto slack invitation via email to user who submitted a gravity form.