GB/T 18304-2001 in English

《GB/T 18304-2001信息技术 因特网中文规范 电子邮件传送格式》由TC28（全国信息技术标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准规定了在因特网电子邮件中使用的中文字符信息和其他文种字符的信息传送格式。本标准适用于因特网电子邮件系统以及相关的应用领域。

1 Scope

This standard specifies message transfer format for Chinese character and characters in other languages in internet email. This standard is applicable to internet email system and associated application fields.

2 Normative References

The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of the normative documents are applicable.

GB/T 1988-1998 Information Technology—7-bit Coded Character Set for Information Interchange (eqv ISO 646: 1991)
GB 2312-1980 Code of Chinese Graphic Character Set for Information Interchange; Primary Set
GB 13000.1-1993 Information Technology—Universal Multiple-Octet Coded Character Set (UCS)—Part 1: Architecture and Basic Multilingual Plane (idt ISO/IEC 10646-1:1993)
GB/T 15273.1-1994 Information Processing—Octets Single-byte Coded Graphic Character Sets—Part 1: Latin Alphabet No.1 (idt ISO 8859-1:1987)
RFC 821 Simple Mail Transfer Protocol
RFC 822 Standard for the Format of ARPA Internet Text Messages
RFC 2045 Multipurpose Internet Mail Extensions Part 1
RFC 2046 Multipurpose Internet Mail Extensions Part 2
RFC 2047 Multipurpose Internet Mail Extensions Part 3
RFC 2048 Multipurpose Internet Mail Extensions Part 4
RFC 2049 Multipurpose Internet Mail Extensions Part 5
RFC 1641 Unicode (Using Unicode with MIME

3 Definitions

For the purposes of this standard, the following definitions apply.

3.1
plain text
text consisting of character, line feed character and form feed character, which does not provide or allow control functions like formatting command, font attribute indication, processing instruction, interpretive instruction or content editing

Foreword i
1 Scope
2 Normative References
3 Definitions
4 General Requirements
Annex A (Informative) UTF-7 and UTF
Annex B (Informative) Base-64 Character
Annex C (Informative) List of Unicode-related charset Assignment
Annex D (Informative) Reference Implementation Model