Constants within the mail subsystem, to indicate how mail messages relate to one another.
Indicates a list of messages should be sorted by the message folder.
Indicates a list of messages should be sorted by the message id.
Indicates a list of messages should be sorted by the message received date.
Indicates a list of messages should be sorted by the message recipients.
Indicates a list of messages should be sorted by the "Blind Carbon Copy" recipients.
Indicates a list of messages should be sorted by the "Carbon Copy" recipients.
Indicates a list of messages should be sorted by the message senders.
Indicates a list of messages should be sorted by the message sent date.
Indicates a list of messages should be sorted by the message size in bytes.
Indicates a list of messages should be sorted by the message subject.
Indicates a list of messages should be sorted by the message text.
Indicates that the new message is created by editing an existing message.
Indicates that the new message is created by forwarding other messages.
Default state for a message - indicates a new message with no association to previous messages.
Indicates that the new message is a reply to an existing mail, addressed only to that mail's sender (not the other recipients).
Indicates that the new message is a reply to an existing mail, addressed both to that mail's sender and the other (CC) recipients.