GB/T 32398-2015 in English
VALIDChinese internet email address―Technical specification for SMTP extension to support
- Issued on:2015-12-31
- Implemented on:2016-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 32398-2015中文电子邮件地址 简单邮件传输协议扩展技术要求》由339-2（工业和信息化部（通信））归口，主管部门为工业和信息化部（通信）。
本标准规定了在互联网体系上使用SMTP扩展支持中文电子邮件地址的技术要求,从服务器端提出相应的技术规范。
本标准适用于各级电子邮件地址注册管理机构、电子邮件地址服务提供商以及软件厂商开发支持中文电子邮件地址的应用或者服务等。
Introduction
GB/T 32398-2015 Standard Overview
This standard is one of the "Chinese Email Address" series of standards, which mainly stipulates the technical requirements for using SMTP extension to support Chinese email addresses on the Internet system. The standard is applicable to email address registration management agencies, service providers and software developers.
| Dimensions | Local-part | Domain-part | Header format |
|---|---|---|---|
| Character encoding | Support UTF-8 encoding | Support IDNA standard (RFC 3490) | GB/T 32397 requirements |
| Format requirements | Allow Chinese characters and punctuation | Support Internationalized Domain Names (IDN) | Extended header fields |
| Compatibility | ACE encoding is required to be compatible with the ASCII system | Punycode conversion must be used | Support MIME structure extension |
Protocol details and technical implementation
SMTP extension framework
- The keyword value of the EHL O command is "SMTP UTF-8".
- The optional parameters of the MAIL and RCPT commands support UTF-8 encoding.
- The VRFY and EXPN commands return UTF-8 strings.
Chinese domain name processing
Both the local part and the domain name part of the email address must be processed according to the following rules:
- The local part supports UTF-8 encoding, but only for the part outside the ASCII character set.
- The domain name is converted to ACE format using Punycode (such as starting with xn--).
- The extension of the mail header field follows the technical requirements of GB/T 32397.
Error handling and compatibility
- If the SMTP server does not support the UTF-8 extension, the mail containing the Chinese mail header must be rejected.
- Response code 533 means "not allowed mailbox name"; response code 550 means "mailbox name is not available".
- Enhanced status code X.6.7 means "non-ASCII mailbox is not allowed".
Implementation suggestions
Server side
- Upgrade the SMTP service to support UTF-8 encoding and SMTP UTF-8 extension.
- Ensure compatibility with the ACE encoding conversion mechanism of the ASCII system.
- Optimize the mail header processing process to ensure compliance with GB/T32397 requirements.
Client
- Detect whether the SMTP server supports UTF-8 extension (through EHL O response).
- If not, provide alternative routing or conversion mechanisms (such as the rewrite strategy defined in RFC 4409).
- Ensure that the encoding method is correctly marked in the mail header to avoid compatibility issues.
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