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I am getting this IMAP response. Notice the folders INBOX.INBOX.ooo and INBOX.INBOX.dfgdfg. INBOX.INBOX folder doesn't exists and it is just a placeholder (NonExistent) folder. 

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).

However I can select this folder

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).

So it appears that INBOX.INBOX is actually INBOX folder because UIDVALIDITY match and I can see the emails there. This is very confusing and it is messing my internal cache. Can someone explain what is going on?

UPDATE: This might give some clues to someone

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).
ekalchev
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  • Your server has a folder aliasing bug? Why are you selecting INBOX.INBOX if it isn't being returned in the LIST response? – Max Jul 31 '17 at 19:12
  • I am using Dovecot server. I am not selecting this manually, because I am using Mailkit library and I can see the library is doing that. – ekalchev Jul 31 '17 at 20:18
  • What have you done to cause the library to select INBOX.INBOX? They don't generally open folders you don't tell it to. – Max Jul 31 '17 at 20:53
  • I am trying to understand server behavior not library behavior. – ekalchev Jul 31 '17 at 21:06
  • Yes, it appears to be a bug; Perhaps INBOX.INBOX is an "internal name" used by dovecot, and it is aliased to INBOX as that is required by the IMAP standard. Perhaps 'dovecot' would be a better tag than mailkit given your last comment. – Max Jul 31 '17 at 21:37

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