Zend_Mail 支持 8 位、base64、二进制、可引用-可打印编码以及备选的传输方式（如 POP3 和 IMAP），同时，也能阅读接收到的电子邮件。
Zend_Mail comes with support for 8-bit, base64, binary, quotable-printable encoding, and alternative transports, such as POP3 and IMAP, as well as the ability to read received e-mail.
这是因为传输的地址被按同样的方式存储，而不管它是被按 32 位模式还是 64 位模式编译的。
This is so that the address transfer is stored the same way whether it is compiled in 32-bit mode or 64-bit mode.
这种对数据的编码方式使邮件传输代理不可能修改结果八位元。
It encodes the data in such a way that the mail transport agent is unlikely to modify the resulting octets.
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