http://blog.youkuaiyun.com/wangdetian168/archive/2007/02/06/1503525.aspx
From RFC 2047:
encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
If you have text in that form, it is encoded.
The encoding can be B (Base64) or Q (quoted-printable)
MIME邮件系统的格式
http://www.codeproject.com/Articles/15611/POP3-Email-Client-with-full-MIME-Support-NET-2-0
From RFC 2047:
encoded-word = "=?" charset "?" encoding "?" encoded-text "?="
If you have text in that form, it is encoded.
The encoding can be B (Base64) or Q (quoted-printable)
MIME邮件系统的格式
http://www.codeproject.com/Articles/15611/POP3-Email-Client-with-full-MIME-Support-NET-2-0