Let me know when you can telnet into gmail to send mail as an unauthenticated user to another gmail user. Let alone DMARC, SPF and other modern protections. The

Let me know when you can telnet into gmail to send mail as an unauthenticated user to another gmail user. Let alone DMARC, SPF and other modern protections. The last time I could do what you describe was more than a decade ago.