HIGHESTMODSEQ not increasing

[Ronny Forberger]

Hi,

I have a problem with my Dovecot IMAP Server on Debian Linux.

I migrated it from FreeBSD to Debian, but since then the HIGHESTMODSEQ 
value for INBOX is not increasing, when I receive new e-mail.

This causes my Groupware not to report any new e-mail via ActiveSync.

Here is the protocol transscript:

[I] <~>-> openssl s_client -crlf -connect mail.forberger-online.de:993
CONNECTED(00000003)
[...]
---
read R BLOCK
* OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE 
LITERAL+ AUTH=PLAIN AUTH=LOGIN] Dovecot (Debian) ready.
A LOGIN REDACTED REDACTED
A OK [CAPABILITY IMAP4rev1 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 BINARY MOVE SNIPPET=FUZZY 
PREVIEW=FUZZY STATUS=SIZE SAVEDATE LITERAL+ NOTIFY SPECIAL-USE] Logged in
A SELECT INBOX (CONDSTORE)
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft $MDNSent Junk NonJunk 
$label4 $label1 $label2 $label3 $label5 Old $Forwarded NOTJUNK $has_cal)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft $MDNSent 
Junk NonJunk $label4 $label1 $label2 $label3 $label5 Old $Forwarded 
NOTJUNK $has_cal \*)] Flags permitted.
* 7286 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1291740963] UIDs valid
* OK [UIDNEXT 158448] Predicted next UID
* OK [HIGHESTMODSEQ 190086] Highest
A OK [READ-WRITE] Select completed (0.001 + 0.000 secs).
A SELECT INBOX (CONDSTORE)
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft $MDNSent Junk NonJunk 
$label4 $label1 $label2 $label3 $label5 Old $Forwarded NOTJUNK $has_cal)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft $MDNSent 
Junk NonJunk $label4 $label1 $label2 $label3 $label5 Old $Forwarded 
NOTJUNK $has_cal \*)] Flags permitted.
* 7288 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1291740963] UIDs valid
* OK [UIDNEXT 158450] Predicted next UID
* OK [HIGHESTMODSEQ 190086] Highest
A OK [READ-WRITE] Select completed (0.002 + 0.000 + 0.001 secs).

The Groupware's IMAP client library is reporting, that MODSEQ is not 
increasing. It stays at 190086, nevertheless I receive new e-mail.

I have tried the commands doveadm index and doveadm force-resync on the 
INBOX, without any change.

My filesystem where the mailboxes reside is on ext4.

Can you help me what is wrong?

Best regards,

Ronny Forberger

-- 
Ronny Forberger
ronnyforberger at ronnyforberger.de