MIME邮件格式的定义在 RFC5322中

http://tools.ietf.org/html/rfc5322

3.4. Address Specification

   Addresses occur in several message header fields to indicate senders

   and recipients of messages.  An address may either be an individual

   mailbox, or a group of mailboxes.

   address         =   mailbox / group

   mailbox         =   name-addr / addr-spec

   name-addr       =   [display-name] angle-addr

   angle-addr      =   [CFWS] "<" addr-spec ">" [CFWS] /

                       obs-angle-addr

   group           =   display-name ":" [group-list] ";" [CFWS]

   display-name    =   phrase

   mailbox-list    =   (mailbox *("," mailbox)) / obs-mbox-list

   address-list    =   (address *("," address)) / obs-addr-list

   group-list      =   mailbox-list / CFWS / obs-group-list

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