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The ENVELOPE structure is a parsed form of the RFC 822 header. Its member names correspond to the RFC 822 field names. It contains the following information:
char *remail;
Remail header, if any.
ADDRESS *return_path;
Error return address.
char *date;
Message composition date string.
ADDRESS *from;
From address list.
ADDRESS *sender;
Sender address list.
ADDRESS *reply_to;
Reply address list.
char *subject;
Message subject string.
ADDRESS *to;
Primary recipient list.
ADDRESS *cc;
Secondary recipient list.
ADDRESS *bcc;
Blind secondary recipient list.
char *in_reply_to;
Replied message ID.
char *message_id;
Message ID.
char *newsgroups;
USENET newsgroups.
char *followup_to;
USENET reply newsgroups.
char *references;
USENET references.