Problem with Dovecot and BlackBerry

Hi all,

i've got a strange behaviour with a BlackBerry Classic Phone (BBOS
10.3.2.2876) in combination with Dovecot 2.2.13 while trying to fetch
mails.

Before burying myself into debugging sessions, i try to get an
understanding if the following is a Client- or a Server-specific error
in the behaviour:

CIGA8 UID FETCH 10009:10035 (UID FLAGS) (CHANGEDSINCE NOMODSEQ) CIGA8 BAD Error in IMAP command UID FETCH: Invalid CHANGEDSINCE modseq.

Following the full conversation.

• OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
  IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN AUTH=DIGEST-MD5 AUTH=CRAM-MD5]
  Dovecot on xxx ready. CIGA1 CAPABILITY
• CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
  STARTTLS AUTH=PLAIN AUTH=LOGIN AUTH=DIGEST-MD5 AUTH=CRAM-MD5 CIGA1 OK Pre-login capabilities listed, post-login capabilities have more. CIGA2 ID ("os" "BlackBerry 10" "os-version" "10.3.2.2876" "vendor"
  "rim" "device" "Classic" "name" "bbimap")
• ID ("name" "Dovecot") CIGA2 OK ID completed. CIGA3 LOGIN xxx xxx
• CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
  SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT
  MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS
  LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES
  WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY MOVE CIGA3 OK Logged in CIGA4 CAPABILITY
• CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE
  SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT
  MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS
  LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES
  WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY MOVE CIGA4 OK Capability completed. CIGA5 LIST "" ""
• LIST (\Noselect) "." "" CIGA5 OK List completed. CIGA6 LIST "" "*"
• LIST (\HasNoChildren) "." folder_a
• LIST (\HasNoChildren) "." folder_b
• LIST (\HasNoChildren) "." folder_c
• LIST (\HasNoChildren) "." sent-mail
• LIST (\HasNoChildren) "." folder_d
• LIST (\HasNoChildren) "." folder_e
• LIST (\HasNoChildren \Trash) "." Trash
• LIST (\HasNoChildren \Drafts) "." Drafts
• LIST (\HasNoChildren) "." folder_f
• LIST (\HasNoChildren) "." folder_g
• LIST (\HasNoChildren) "." INBOX CIGA6 OK List completed. CIGA7 SELECT INBOX (CONDSTORE)
• FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
• OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)]
  Flags permitted.
• 7 EXISTS
• 0 RECENT
• OK [UIDVALIDITY 1391686038] UIDs valid
• OK [UIDNEXT 10036] Predicted next UID
• OK [HIGHESTMODSEQ 1608] Highest CIGA7 OK [READ-WRITE] Select completed (0.000 secs). CIGA8 UID FETCH 10009:10035 (UID FLAGS) (CHANGEDSINCE NOMODSEQ) CIGA8 BAD Error in IMAP command UID FETCH: Invalid CHANGEDSINCE modseq. CIGA9 LOGOUT
• BYE Logging out CIGA9 OK Logout completed.

Thanks in advance!

Luca Bertoncello (lucabert@lucabert.de)