If you are writing or looking for a specific blog post, let me know:
CMS platforms often use variations of this term (e.g., register_email syntax in Tiki Wiki templates) to handle user login fields when the email itself serves as the username. Why This Matters in a Blog Post Register_Email
Scientific platforms like the Joint Science Operations Center (JSOC) require users to register their email before exporting solar data via tools like SunPy. If you are writing or looking for a