Message flags:

(RFC 3501)

• \Seen - Message has been read
• \Answered - Message has been replied to
• \Flagged - Message is marked as important or flagged for attention
• \Deleted - Message is marked for deletion
• \Draft - Message is a draft
• \Recent - Message is new in the mailbox since last access

Mailbox flags:

(RFC 3501)

• \Noinferiors - Mailbox cannot have child mailboxes
• \Noselect - Mailbox cannot be selected (often used for namespace containers)
• \Marked - Mailbox contains new messages
• \Unmarked - Mailbox has no new messages

(RFC 3348)

• \HasChildren - Mailbox has child mailboxes
• \HasNoChildren - Mailbox has no child mailboxes

Special-use mailbox attributes (RFC 6154):

• \All - Contains all messages
• \Archive - Used for archiving messages
• \Drafts - Contains draft messages
• \Flagged - Contains flagged messages
• \Junk - Contains spam/junk messages
• \Sent - Contains sent messages
• \Trash - Contains deleted messages
• \Important - Contains important messages