Mailbox name
Total number of messages
Number of recent messages
UID validity value (changes if UIDs are reassigned)
Next UID to be assigned
OptionalunseenNumber of unseen messages (may be absent)
OptionalhighestThe mailbox's highest mod-sequence value (CONDSTORE / RFC 7162), when the
server advertises it. A monotonic counter that advances whenever a
message is added, expunged, or has its flags changed, so a connector can
persist it as a "since last poll" cursor and skip re-scanning a mailbox
whose value hasn't moved. Absent when the server or the specific mailbox
does not support mod-sequences (e.g. it reports NOMODSEQ). Returned as a
number; a server with an astronomically large mod-sequence counter could
in theory exceed safe-integer precision, though real mailboxes stay far
below that.
Status of a selected mailbox.