NC 26.02 nach Update auf Mail 3.21 Imap Server nicht erreichbar

Hallo nachdem ich die neue Versio 3.21 der Mail-App eingespielt
habe kann ich keine neuen Email-Kontos anlegen und in den
bestehenden Emailkonten werden die Emails nicht mehr angezeigt.
Unter snappymail klappt das immer noch ohne Probleme!?

Unten ein Log Eintrag:

{“reqId”:“ZIrIs6ImCFIQc8HJSVnFxwAAABE”,“level”:3,“time”:“2023-06-15T08:15:48+00:00”,“remoteAddr”:“192.168.135.14”,“user”:“125132FC-FA1C-4780-A280-DE9458AAFA8E”,“app”:“mail”,“method”:“POST”,“url”:“/nextcloud/index.php/apps/mail/api/accounts”,“message”:“Failed syncing the newly created accountIMAP error synchronizing account 100: Mail server closed the connection unexpectedly.”,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/114.0”,“version”:“26.0.2.1”,“exception”:{“Exception”:“OCA\Mail\Exception\ServiceException”,“Message”:“IMAP error synchronizing account 100: Mail server closed the connection unexpectedly.”,“Code”:4,“Trace”:[{“file”:“/var/www/html/nextcloud/apps/mail/lib/Controller/AccountsController.php”,“line”:391,“function”:“sync”,“class”:“OCA\Mail\IMAP\MailboxSync”,“type”:“->”,“args”:[“*** sensitive parameters replaced “]},{“file”:”/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",“line”:230,“function”:“create”,“class”:“OCA\Mail\Controller\AccountsController”,“type”:“->”,“args”:[" sensitive parameters replaced “]},{“file”:”/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",“line”:137,“function”:“executeController”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:“->”,“args”:[[“OCA\Mail\Controller\AccountsController”],“create”]},{“file”:“/var/www/html/nextcloud/lib/private/AppFramework/App.php”,“line”:183,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:“->”,“args”:[[“OCA\Mail\Controller\AccountsController”],“create”]},{“file”:“/var/www/html/nextcloud/lib/private/Route/Router.php”,“line”:315,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:“::”,“args”:[“OCA\Mail\Controller\AccountsController”,“create”,[“OC\AppFramework\DependencyInjection\DIContainer”],[“mail.accounts.create”]]},{“file”:“/var/www/html/nextcloud/lib/base.php”,“line”:1058,“function”:“match”,“class”:“OC\Route\Router”,“type”:“->”,“args”:[“/apps/mail/api/accounts”]},{“file”:“/var/www/html/nextcloud/index.php”,“line”:36,“function”:“handleRequest”,“class”:“OC”,“type”:“::”,“args”:[]}],“File”:“/var/www/html/nextcloud/apps/mail/lib/IMAP/MailboxSync.php”,“Line”:120,“Previous”:{“Exception”:“Horde_Imap_Client_Exception”,“Message”:“Mail server closed the connection unexpectedly.”,“Code”:4,“Trace”:[{“file”:“/var/www/html/nextcloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php”,“line”:4542,“function”:“read”,“class”:“Horde_Imap_Client_Socket_Connection_Socket”,“type”:“->”,“args”:[]},{“file”:“/var/www/html/nextcloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php”,“line”:4314,“function”:“_getLine”,“class”:“Horde_Imap_Client_Socket”,“type”:“->”,“args”:[[“Horde_Imap_Client_Interaction_Pipeline”,[[],[]],[“Horde_Imap_Client_Fetch_Results”]]]},{“file”:“/var/www/html/nextcloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php”,“line”:4242,“function”:“_sendCmdChunk”,“class”:“Horde_Imap_Client_Socket”,“type”:“->”,“args”:[[“Horde_Imap_Client_Interaction_Pipeline”,[[],[]],[“Horde_Imap_Client_Fetch_Results”]],[[“Horde_Imap_Client_Interaction_Command”,[],true,false,null,null,[“Horde_Imap_Client_Interaction_Pipeline”,[[],[]],[“Horde_Imap_Client_Fetch_Results”]],null,“11”]]]},{“file”:“/var/www/html/nextcloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php”,“line”:3904,“function”:“_sendCmd”,“class”:“Horde_Imap_Client_Socket”,“type”:“->”,“args”:[[“Horde_Imap_Client_Interaction_Command”,[],true,false,null,null,[“Horde_Imap_Client_Interaction_Pipeline”,[[],[]],[“Horde_Imap_Client_Fetch_Results”]],null,“11”]]},{“file”:“/var/www/html/nextcloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Base.php”,“line”:3330,“function”:“_getMyACLRights”,“class”:“Horde_Imap_Client_Socket”,“type”:“->”,“args”:[[“Horde_Imap_Client_Mailbox”]]},{“file”:“/var/www/html/nextcloud/apps/mail/lib/IMAP/FolderMapper.php”,“line”:122,“function”:“getMyACLRights”,“class”:“Horde_Imap_Client_Base”,“type”:“->”,“args”:[“shared”]},{“file”:“/var/www/html/nextcloud/apps/mail/lib/IMAP/MailboxSync.php”,“line”:118,“function”:“fetchFolderAcls”,“class”:“OCA\Mail\IMAP\FolderMapper”,“type”:“->”,“args”:[[[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”],[“OCA\Mail\Folder”]],[“Horde_Imap_Client_Socket”,[“HICenv”,“HICflags”,“HIChdrs”,“HICdate”,“HICsize”,“HICstruct”],true,true]]},{“file”:“/var/www/html/nextcloud/apps/mail/lib/Controller/AccountsController.php”,“line”:391,“function”:“sync”,“class”:“OCA\Mail\IMAP\MailboxSync”,“type”:“->”,“args”:[" sensitive parameters replaced “]},{“file”:”/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",“line”:230,“function”:“create”,“class”:“OCA\Mail\Controller\AccountsController”,“type”:“->”,“args”:[" sensitive parameters replaced ***”]},{“file”:“/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php”,“line”:137,“function”:“executeController”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:“->”,“args”:[[“OCA\Mail\Controller\AccountsController”],“create”]},{“file”:“/var/www/html/nextcloud/lib/private/AppFramework/App.php”,“line”:183,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:“->”,“args”:[[“OCA\Mail\Controller\AccountsController”],“create”]},{“file”:“/var/www/html/nextcloud/lib/private/Route/Router.php”,“line”:315,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:“::”,“args”:[“OCA\Mail\Controller\AccountsController”,“create”,[“OC\AppFramework\DependencyInjection\DIContainer”],[“mail.accounts.create”]]},{“file”:“/var/www/html/nextcloud/lib/base.php”,“line”:1058,“function”:“match”,“class”:“OC\Route\Router”,“type”:“->”,“args”:[“/apps/mail/api/accounts”]},{“file”:“/var/www/html/nextcloud/index.php”,“line”:36,“function”:“handleRequest”,“class”:“OC”,“type”:“::”,“args”:}],“File”:“/var/www/html/nextcloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket/Connection/Socket.php”,“Line”:147},“message”:“Failed syncing the newly created accountIMAP error synchronizing account 100: Mail server closed the connection unexpectedly.”,“exception”:,“CustomMessage”:“Failed syncing the newly created accountIMAP error synchronizing account 100: Mail server closed the connection unexpectedly.”},“id”:“648ac8c8182f2”}

Kann mir jemand weiterhelfen?

Grüße
Daniel