Another important change demanded by my beta-testers was support for 8-bit MIME (MultipurposeInternetMailExtensions) operation.
我的公测人员要求加入的另一个重要功能是支持8位的MIME (Multipurpose Internet Mail Extensions，多用途的网际邮件扩充协议)操作。
2
RFC 1521 and RFC 1522 specify the types and subtypes for MultipurposeInternetMailExtensions (MIME).
RFC 1521和RFC 1522标注了“多功能因特网邮件扩充”(MIME)的类型和子类型。
3
Secure MultipurposeInternetMailExtensions (S/MIME) allows digital signatures to be attached to e-mail messages, such that the recipient can verify the identity of the signer.
安全多用途 Internet 邮件扩展（Secure Multipurpose Internet Mail Extensions，S/MIME）允许将数字签名附加到电子邮件消息上，这样接收方就可以验证签名者的身份。