RFC 6531, "SMTP Extension for Internationalized Email", February 2012Source of RFC: eai (app)
Errata ID: 4996
Status: Held for Document Update
Reported By: Vitaliy V. Tokarev
Date Reported: 2017-04-16
Held for Document Update by: Alexey Melnikov
Date Held: 2017-09-07
Section 3.3 says:
The definition of <atext> is extended to permit both the RFC 5321 definition and a UTF-8 string. That string MUST NOT contain any of the ASCII graphics or control characters.
It should say:
The definition of <atext> is extended to permit both the RFC 5321 definition and a UTF-8 string. That string MUST NOT contain any of the Extended ASCII graphics (%d128-255) or control characters.
The question is: what is "ASCII graphics characters"? Either meant that is possible to transmit 8bit characters, but they should not be in range %d128-255. Or something else. A better clarification is appreciated.
Alexey Melnikov: see Ned Freed' reply and the thread that follows <https://www.ietf.org/mail-archive/web/ima/current/msg05506.html>