. . "RFC821"@en . "72"^^ . . . "821" . . . "RFC 821: Simple Mail Transfer Protocol"@en . . "RFC 821: Simple Mail Transfer Protocol"@en . "Simple Mail Transfer Protocol"@en . . . . . . . . . . "Simple Mail Transfer Protocol"@en . "journals/rfc/rfc821" . . . . . . "request for comments publication"@en . . . . "\u043F\u0443\u0431\u043B\u0456\u043A\u0430\u0446\u0456\u044F \u0437\u0430\u043F\u0438\u0442\u0443 \u043A\u043E\u043C\u0435\u043D\u0442\u0430\u0440\u0456\u0432"@uk . . . . . . "RFC 821: Simple Mail Transfer Protocol"@en . "10.17487/RFC0821" . . . . . "1982-08-01T00:00:00Z"^^ . . .