Problem with Dovecot and BlackBerry

[Luca Bertoncello]

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.
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* 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.
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Thanks in advance!

Luca Bertoncello
(lucabert at lucabert.de)