New mails not visible (affects AppSuite and WebDAV clients)

[Brief]

I have a problem with mail sorting.

Appsuite:
If the mails are sorted by date, the newest mail in a folder (inbox) is not displayed.

At first, mails 30 to 1(oldest) are displayed (sorted by date, descending). On scrolling down, more mails are loaded and prepended to the displayed list. The newest mail is only visible after every mail in the folder is loaded and displayed.
If sorting is changed to date, ascending, mails 1 to 30 are displayed. On scrolling down, more mails are appended.

If sorting is changed to unread, descending, mails 30 to 1 are displayed.
If sorting is changed to unread, ascending, mails 2000 to 1970 are displayed (on 2000 mails in folder)!


WebDAV (iPhone):
Mails in the native mail app are sorted by date. The first mails are loaded first (like in the AppSuite) to a limit of 600 (com.openexchange.usm.eas.mail.limit).

Unlike in the AppSuite, a user is not able to display the newest message.


Using open-xchange 7.6.2-Rev16.

[thiel]

Sounds like my problem.
I have opened a ticket and give feedback as soon as there is a reply.

I have not tried WEBDAV. But on Web, I have the same problem.

[thiel]

Did you try to search your Inbox through Webinterface? I cant use the Searchbox.

[Brief]

I never used the search before but it seems to work.

[thiel]

You can try this:

go to imap.properties and insert this line:

com.openexchange.imap.allowESORT=false

Perhaps this helps.

[Brief]

This solves the problem at first glance.
What does this option do? I Can't find any documentation about it.

[thiel]

There seems to be an extension to IMAP: ESORT.
Perhaps your mail server does not support this extension.
This command turns off the use of it in OX.

[Brief]

I'm using dovecot and it should support it:
* 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 QUOTA