[kmail2] [Bug 419782] New: Unable to connect to IMAP server

[Daniel Kraus]

https://bugs.kde.org/show_bug.cgi?id=419782

            Bug ID: 419782
           Summary: Unable to connect to IMAP server
           Product: kmail2
           Version: 5.13.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: bovender at bovender.de
  Target Milestone: ---

SUMMARY
I am no longer able to connect to my IMAP server with KMail. The IMAP server
logs failed login attempts that contain no user name ("dovecot: imap-login:
Disconnected (no auth attempts in 1 secs): user=<>"). All other clients that I
tried *are* able to connect to the server (mutt [on the same workstation as
KMail], Roundcube, K-9 mail). KMail used to work with this server for several
years. Something happened. I did move the server to a different machine, but
the setup is done with Ansible, so should be identical to the old machine, and
again, the other mail clients have no problem connecting to the server.

I completely removed kmail along with akonadi-server and other packages, and
removed the data files from ~/.local/share and ~/.config.

When I try to add the IMAP account to a fresh installation of KMail, the UI
complains "Could not convert value of setting 'AccountIdentity' to required
type."

Terminal output:

```
$ kmail
No text-to-speech plug-ins were found.
org.kde.pim.akonadicore: not referenced  14
"QFormBuilder was unable to create a custom widget of the class 'KLineEdit';
defaulting to base class 'QLineEdit'."
"QFormBuilder was unable to create a custom widget of the class 'KLineEdit';
defaulting to base class 'QLineEdit'."
"QFormBuilder was unable to create a custom widget of the class 'KLineEdit';
defaulting to base class 'QLineEdit'."
org.kde.pim.accountwizard: Did not find D-Bus method:  "setAccountIdentity" 
available methods are:
org.kde.pim.accountwizard: "destroyed(QObject*)"
org.kde.pim.accountwizard: "destroyed()"
org.kde.pim.accountwizard: "objectNameChanged(QString)"
org.kde.pim.accountwizard: "deleteLater()"
org.kde.pim.accountwizard: "_q_reregisterTimers(void*)"
org.kde.pim.accountwizard: "_q_serviceOwnerChanged(QString,QString,QString)"
org.kde.pim.accountwizard: Impossible to convert argument :  QVariant(int,
1090336957)
```

SOFTWARE/OS VERSIONS
KDE Plasma: KDE neon 5.18 user edition
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1

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