On 07/07/2019 18:12 Arnold Opio Oree via dovecot <dovecot@dovecot.org> wrote:
Dovecot Team,
I'd like to report a number of bugs, that are to my view all critical.
System: Replicated on multiple Debian 10 (Buster) systems
Dovecot Version(s): 2.3.4.1
doveadm-sync -1/general
1) If DIRNAMEs are not different between command line and mail_location doveadm sync will fail, saying that the source and destination directories are the same
2) The -n / -N flags do not work, and a sync will fail strangely if location is specified in the namespace definition
3) Adds mbox to path name under mailbox directory (where syncing from an mbox source)
4) Not having the mailboxes at source named the same as those at destination causes errors and partial sync
5) Not having the target mailboxes formatted to receive the sync (/<mailboxroot>/DIRNAME/) will cause sync errors.
doveadm-sync
1) With large synchronizations UIDs are corrupted where multiple syncs are executed and the program can no longer synchronize
dovecot
1) Panics and fails to expand ~ to user home: observed cases are where multiple namespaces are being used
Please let me know if you need me to elaborate or to provide any further information that you may need to replicate the bugs, or if I can help in any other way.
With regards to the last error that I requested help on i.e. \Noselect. This has been resolved more-or-less by the workarounds that I have implemented for the bugs reported above.
I have seen a number of threads whilst researching the \Noselect issue where people have been very confused. My finding was that \Noselect is a function of the IMAP specification server-side implementation RFC3501 (
https://tools.ietf.org/html/rfc3501#section-6.3.6). And for me the server was returning directories with \Noselect because the mailboxes were malformed on account of dovadm-sync errors. In order to fix this I formed a bash command to transverse the mailbox hierarchy and create the missing folders critical to the sdbox format, namely DIRNAME.
Kind regards,
Arnold Opio Oree
Chief Executive Officer
Parallax Digital Technologies
tel : +44 (0) 333 577 8587
fax : +44 (0) 20 8711 2477
Parallax Digital Technologies is a trading name of Parallax Global Limited. U.K. Co. No. 08836288
The contents of this e-mail are confidential. If you are not the intended recipient you are to delete this e-mail immediately, disregard its contents and disclose them to no other persons.
-----Original Message-----
From: Arnold Opio Oree via dovecot <
dovecot@dovecot.org>
Reply-To:
arnoldoree@parallaxict.com, Arnold Opio Oree <
arnold.oree@parallaxict.com>
Subject: Re: Applying Dovecot for a large / deep folder-hierarchy archive.
Date: Thu, 04 Jul 2019 14:52:28 +0100
Hi all,
The guidance provided so far has been really helpful, and has helped a great deal to bringing down wasted energy on finding and executing a viable path. I am now at the final due action to complete our Dovecot application to our use-case, but am stuck on an issue that I cannot find any easily accessible documentation on.
Generally this is what has been done:
1. Uploaded the enterprise data PST to the target groupware server.
2. Prepared the server by changing the mailbox format to sdbox and the the Dovecot mail location to mail_location=/var/vmail/domain/user/mail/
3. Converted the pst (on-server) to a recursive mbox hierarchy using readpst
4. Executed doveadm-sync to convert mbox hierarchy data into sdbox and to copy it into the enterprise archive user's mailboxes
4.i. The biggest issue I faced at this point was doveadm-sync saying that the source and destination pointed to the same location, whereas they clearly did not.
4.i.a. I resolved this by removing the location= setting from the target namespace, and allowing it to default to mail_location = setting, and then using a completely different DIRNAME for the import doveadm-sync execution (which was the desired final DIRNAME); I then once the sync had been successful, changed the mail_location DIRNAME so that it pointed to the imported mail DIRNAME; and hence the imported email data was in the live mailboxes
4.i.b. doveadm-import failed several times, and was throwing quite inexplicable errors, so I moved onto doveadm-sync
4.i.c. I also had to make sure that the source and destination folder names matched, otherwise doveadm-syc threw very many errors and only partially imported the data
4.i.d. An issue which I decided just to live with is that an mbox DIRNAME was added to each mailbox as well as the DIRNAME specified so the path to mail is mbox/dbox-Mails. My thought is that with the data live on an IMAP server it will be possible to do a dysync through TCP to correct this problem.
The final issue that I am facing now, is that when readpst finds empty folders in the source pst hierarchy, it does not create an mbox file in the mbox hierarchy folder space. This causes doveadm-sync to not create the target data required for its mailbox structure i.e. DIRNAME sub-folder and index file (with our configuration). At this point either doveadm-sync or the dovecot process makes these empty folders not selectable.
The question now is how would I go about making all of these folders selectable, e.g. with an internal or external command line tool to change flags / create necessary sdbox mailbox constituent data?
Many thanks,
Arnold Opio Oree
Chief Executive Officer
Parallax Digital Technologies
tel : +44 (0) 333 577 8587
fax : +44 (0) 20 8711 2477
Parallax Digital Technologies is a trading name of Parallax Global Limited. U.K. Co. No. 08836288
The contents of this e-mail are confidential. If you are not the intended recipient you are to delete this e-mail immediately, disregard its contents and disclose them to no other persons.
-----Original Message-----
From: Arnold Opio Oree via dovecot <
dovecot@dovecot.org>
Reply-To:
arnoldoree@parallaxict.com, Arnold Opio Oree <
arnold.oree@parallaxict.com>
To: Robert Schetterer <
rs@sys4.de>,
dovecot@dovecot.org
Subject: Re: Applying Dovecot for a large / deep folder-hierarchy archive.
Date: Thu, 27 Jun 2019 12:05:35 +0100
Also you may run into client limits.... i ve seen this with outlook,apple mail, thunderbird via imap in the past
Thanks for this note Robert, it was not really an aspect that I was
considering.
We are operating our groupware services user access through both
Evolution Groupware and KDE Kontact / KMail on Debian Linux
workstations. Hopefully if there is a client issue it should be local
to only one groupware client.
I will be sure to study / investigate in this - client - area should any issues that are not traceable to the server-side arise.
Many thanks,
Arnold Opio Oree
Chief Executive Officer
Parallax Digital Technologies
arnoldoree@parallaxdt.com
http://www.parallaxdt.com
tel : +44 (0) 333 577 8587
fax : +44 (0) 20 8711 2477
Parallax Digital Technologies is a trading name of Parallax Global
Limited. U.K. Co. No. 08836288
The contents of this e-mail are confidential. If you are not the
intended recipient you are to delete this e-mail immediately, disregard
its contents and disclose them to no other persons.
-----Original Message-----
From: Robert Schetterer via dovecot <
dovecot@dovecot.org
>
Reply-To: Robert Schetterer <
rs@sys4.de
>
To:
dovecot@dovecot.org
Subject: Re: Applying Dovecot for a large / deep folder-hierarchy
archive.
Date: Thu, 27 Jun 2019 12:53:49 +0200
Am 27.06.2019 um 07:35 schrieb Aki Tuomi via dovecot:
On 26.6.2019 22.12, Arnold Opio Oree via dovecot wrote:Hello to you all,
I'd like to ask about my intended application of Dovecot to createa folder-hierarchy for storing our enterprise emails, which aretreated as live data rather than archives for compliance oroccasional / reactive retrieval.
The data is presently not that large (a few gigabytes), but it isexpected to grow rapidly. Up to this stage the data has beencontainedin a Microsoft Exchange mailbox (2013), and then in an offline PST.The move to the offline PST was by necessity, as the large numberoffolders, and depth of hierarchy to my best understanding caused theexchange server / outlook / evolution mail clients to begin tomalfunction. To cope with this the archive was broken up and thebulk stored in the offline PST and the most active componentsstored inonline Exchange mailboxes.
I have some understanding of the fs mbox format, and also themitigations to be made for certain characters / strings. My mainconcern is whether Dovecot is likely to be able to cope well with alarge number of folders / depth of hierarcy.
I will really appreciate any help / advice you can give.
Best regards,
Arnold Opio Oree
Hi!
Dovecot 2.2.34/2.3 supports unlimited folder depth, the only limitingfactor is that the total name may not exceed 4096 bytes. Alsoindividualfolder names may not exceed 255 bytes.
Prior to that the limit is 255 per folder up to 16 levels.
I can't recommend using 'mbox' storage format, please consider usingmaildir or sdbox instead.
Aki
