IMAP responses repeating

Question

Can somebody explain IMAP server responses behavior? When I send single command, response meets expectations:

C: A0001 FETCH 10 (BODY[HEADER.FIELDS (SUBJECT)])
S: * 10 FETCH (BODY[HEADER.FIELDS (SUBJECT)] {21}
   Subject: FW: test

   )
   A0001 OK FETCH completed.

But if I send several command one by one, responses behavior is unclear:

C: A0001 FETCH 10 (BODY[HEADER])
S: * 10 FETCH (BODY[HEADER] {1632}
   ...
   A0001 OK FETCH completed.
C: A0002 FETCH 10 (BODY[HEADER.FIELDS (SUBJECT)])
S: * 10 FETCH (BODY[HEADER] {1632}
   ...
   A0001 OK FETCH completed.
C: A0003 FETCH 10 BODY[TEXT]
S: * 10 FETCH (BODY[HEADER.FIELDS (SUBJECT)] {21}
   Subject: FW: test

   )
   A0002 OK FETCH completed.

Why are the responses repeated? And how to fix it? Code

Answer 1

The problem was that writing to the ssl stream occurred in a read loop from the ssl stream.