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- rfc-index @rfc
- 1 Hits, Last modified:
- 17487/RFC7292)
7293 The Require-Recipient-Valid-Since Header Field and SMTP Service
Extension. W.
- rfc-ref @rfc
- 1 Hits, Last modified:
- W. and M. Kucherawy, "The Require-Recipient-Valid-Since Header Field and SMTP Service Extension", RFC 729