我收到了这个IMAP回复。请注意文件夹INBOX.INBOX.ooo和INBOX.INBOX.dfgdfg。 INBOX.INBOX文件夹不存在，它只是一个占位符（NonExistent）文件夹。
C: A00000096 STATUS INBOX (UIDVALIDITY HIGHESTMODSEQ)
S: * STATUS INBOX (UIDVALIDITY 1491227400 HIGHESTMODSEQ 17436)
S: A00000096 OK Status completed (0.001 + 0.000 secs).
C: A00000097 LIST "" "INBOX.*" RETURN (SUBSCRIBED CHILDREN STATUS (UIDVALIDITY))
S: * LIST (\Subscribed \HasNoChildren \UnMarked) "." INBOX.INBOX.ooo
S: * STATUS INBOX.INBOX.ooo (UIDVALIDITY 1491227902)
S: * LIST (\HasNoChildren \UnMarked) "." INBOX.INBOX.dfgdfg
S: * STATUS INBOX.INBOX.dfgdfg (UIDVALIDITY 1491227900)
S: A00000097 OK List completed (0.001 + 0.000 secs).
但是我可以选择这个文件夹
A00000092 SELECT INBOX.INBOX (CONDSTORE)
S: * OK [CLOSED] Previous mailbox closed.
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted.
S: * 554 EXISTS
S: * 0 RECENT
S: * OK [UIDVALIDITY 1491227400] UIDs valid
S: * OK [UIDNEXT 18263] Predicted next UID
S: * OK [HIGHESTMODSEQ 17436] Highest
S: A00000092 OK [READ-WRITE] Select completed (0.001 + 0.000 secs).
所以看起来INBOX.INBOX实际上是INBOX文件夹，因为UIDVALIDITY匹配，我可以在那里看到电子邮件。这非常令人困惑，它正在弄乱我的内部缓存。有人可以解释发生了什么吗？
更新： 这可能会给某些人提供一些线索
C: A00000001 NAMESPACE
S: * NAMESPACE (("INBOX." ".")) NIL NIL
S: A00000001 OK Namespace completed (0.001 + 0.000 secs).
C: A00000002 LIST "" "INBOX"
S: * LIST (\HasChildren) "." INBOX
S: A00000002 OK List completed (0.002 + 0.000 + 0.001 secs).