Error Could not get message flag options from IMAP: IMAP error reported by server.

### Steps to reproduce

1. Install newest Mail app v. 5.10.9
2. Setup an iCloud Account with NC Server 34.0.2 
3. Wait some time and let some cron jobs pass


### Expected behavior

No errors within the nextcloud log

### Actual behavior

The following error occurs with every cron job:

```
ServiceException
Could not get message flag options from IMAP: IMAP error reported by server.
```

```json
{
  "reqId": "7JqpdQP6yaPV4HuHAzYn",
  "level": 3,
  "time": "2026-07-24T07:45:12+00:00",
  "remoteAddr": "",
  "user": "--",
  "app": "mail",
  "method": "",
  "url": "--",
  "scriptName": "/var/www/html/owncloud/cron.php",
  "message": "Cron mail sync failed for account 21",
  "userAgent": "--",
  "version": "34.0.2.1",
  "occ_command": [
    "/var/www/html/owncloud/cron.php"
  ],
  "exception": {
    "Exception": "OCA\\Mail\\Exception\\ServiceException",
    "Message": "Could not get message flag options from IMAP: IMAP error reported by server.",
    "Code": 0,
    "Trace": [
      {
        "file": "/var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
        "line": 504,
        "function": "isPermflagsEnabled",
        "class": "OCA\\Mail\\Service\\MailManager",
        "type": "->"
      },
      {
        "file": "/var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
        "line": 269,
        "function": "runPartialSync",
        "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
        "type": "->"
      },
      {
        "file": "/var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
        "line": 134,
        "function": "sync",
        "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
        "type": "->",
        "args": [
          "*** sensitive parameters replaced ***"
        ]
      },
      {
        "file": "/var/www/html/owncloud/apps/mail/lib/BackgroundJob/SyncJob.php",
        "line": 128,
        "function": "syncAccount",
        "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
        "type": "->",
        "args": [
          "*** sensitive parameters replaced ***"
        ]
      },
      {
        "file": "/var/www/html/owncloud/lib/public/BackgroundJob/Job.php",
        "line": 50,
        "function": "run",
        "class": "OCA\\Mail\\BackgroundJob\\SyncJob",
        "type": "->"
      },
      {
        "file": "/var/www/html/owncloud/lib/public/BackgroundJob/TimedJob.php",
        "line": 86,
        "function": "start",
        "class": "OCP\\BackgroundJob\\Job",
        "type": "->"
      },
      {
        "file": "/var/www/html/owncloud/core/Service/CronService.php",
        "line": 204,
        "function": "start",
        "class": "OCP\\BackgroundJob\\TimedJob",
        "type": "->"
      },
      {
        "file": "/var/www/html/owncloud/core/Service/CronService.php",
        "line": 107,
        "function": "runCli",
        "class": "OC\\Core\\Service\\CronService",
        "type": "->"
      },
      {
        "file": "/var/www/html/owncloud/cron.php",
        "line": 52,
        "function": "run",
        "class": "OC\\Core\\Service\\CronService",
        "type": "->"
      }
    ],
    "File": "/var/www/html/owncloud/apps/mail/lib/Service/MailManager.php",
    "Line": 802,
    "Previous": {
      "Exception": "Horde_Imap_Client_Exception_ServerResponse",
      "Message": "IMAP error reported by server.",
      "Code": 0,
      "Trace": [
        {
          "file": "/var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php",
          "line": 4321,
          "function": "_getLine",
          "class": "Horde_Imap_Client_Socket",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php",
          "line": 4245,
          "function": "_sendCmdChunk",
          "class": "Horde_Imap_Client_Socket",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php",
          "line": 1753,
          "function": "_sendCmd",
          "class": "Horde_Imap_Client_Socket",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Base.php",
          "line": 1731,
          "function": "_status",
          "class": "Horde_Imap_Client_Socket",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/lib/Service/MailManager.php",
          "line": 800,
          "function": "status",
          "class": "Horde_Imap_Client_Base",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
          "line": 504,
          "function": "isPermflagsEnabled",
          "class": "OCA\\Mail\\Service\\MailManager",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
          "line": 269,
          "function": "runPartialSync",
          "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
          "line": 134,
          "function": "sync",
          "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
          "type": "->",
          "args": [
            "*** sensitive parameters replaced ***"
          ]
        },
        {
          "file": "/var/www/html/owncloud/apps/mail/lib/BackgroundJob/SyncJob.php",
          "line": 128,
          "function": "syncAccount",
          "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
          "type": "->",
          "args": [
            "*** sensitive parameters replaced ***"
          ]
        },
        {
          "file": "/var/www/html/owncloud/lib/public/BackgroundJob/Job.php",
          "line": 50,
          "function": "run",
          "class": "OCA\\Mail\\BackgroundJob\\SyncJob",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/lib/public/BackgroundJob/TimedJob.php",
          "line": 86,
          "function": "start",
          "class": "OCP\\BackgroundJob\\Job",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/core/Service/CronService.php",
          "line": 204,
          "function": "start",
          "class": "OCP\\BackgroundJob\\TimedJob",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/core/Service/CronService.php",
          "line": 107,
          "function": "runCli",
          "class": "OC\\Core\\Service\\CronService",
          "type": "->"
        },
        {
          "file": "/var/www/html/owncloud/cron.php",
          "line": 52,
          "function": "run",
          "class": "OC\\Core\\Service\\CronService",
          "type": "->"
        }
      ],
      "File": "/var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php",
      "Line": 4624
    },
    "message": "Cron mail sync failed for account {accountId}",
    "exception": "{\"class\":\"OCA\\Mail\\Exception\\ServiceException\",\"message\":\"Could not get message flag options from IMAP: IMAP error reported by server.\",\"code\":0,\"file\":\"/var/www/html/owncloud/apps/mail/lib/Service/MailManager.php:802\",\"trace\":\"#0 /var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php(504): OCA\\Mail\\Service\\MailManager->isPermflagsEnabled()\\n#1 /var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php(269): OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer->runPartialSync()\\n#2 /var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php(134): OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer->sync()\\n#3 /var/www/html/owncloud/apps/mail/lib/BackgroundJob/SyncJob.php(128): OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer->syncAccount()\\n#4 /var/www/html/owncloud/lib/public/BackgroundJob/Job.php(50): OCA\\Mail\\BackgroundJob\\SyncJob->run()\\n#5 /var/www/html/owncloud/lib/public/BackgroundJob/TimedJob.php(86): OCP\\BackgroundJob\\Job->start()\\n#6 /var/www/html/owncloud/core/Service/CronService.php(204): OCP\\BackgroundJob\\TimedJob->start()\\n#7 /var/www/html/owncloud/core/Service/CronService.php(107): OC\\Core\\Service\\CronService->runCli()\\n#8 /var/www/html/owncloud/cron.php(52): OC\\Core\\Service\\CronService->run()\\n#9 {main}\",\"previous\":{\"class\":\"Horde_Imap_Client_Exception_ServerResponse\",\"message\":\"IMAP error reported by server.\",\"code\":0,\"file\":\"/var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php:4624\",\"trace\":\"#0 /var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php(4321): Horde_Imap_Client_Socket->_getLine()\\n#1 /var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php(4245): Horde_Imap_Client_Socket->_sendCmdChunk()\\n#2 /var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Socket.php(1753): Horde_Imap_Client_Socket->_sendCmd()\\n#3 /var/www/html/owncloud/apps/mail/vendor/bytestream/horde-imap-client/lib/Horde/Imap/Client/Base.php(1731): Horde_Imap_Client_Socket->_status()\\n#4 /var/www/html/owncloud/apps/mail/lib/Service/MailManager.php(800): Horde_Imap_Client_Base->status()\\n#5 /var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php(504): OCA\\Mail\\Service\\MailManager->isPermflagsEnabled()\\n#6 /var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php(269): OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer->runPartialSync()\\n#7 /var/www/html/owncloud/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php(134): OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer->sync()\\n#8 /var/www/html/owncloud/apps/mail/lib/BackgroundJob/SyncJob.php(128): OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer->syncAccount()\\n#9 /var/www/html/owncloud/lib/public/BackgroundJob/Job.php(50): OCA\\Mail\\BackgroundJob\\SyncJob->run()\\n#10 /var/www/html/owncloud/lib/public/BackgroundJob/TimedJob.php(86): OCP\\BackgroundJob\\Job->start()\\n#11 /var/www/html/owncloud/core/Service/CronService.php(204): OCP\\BackgroundJob\\TimedJob->start()\\n#12 /var/www/html/owncloud/core/Service/CronService.php(107): OC\\Core\\Service\\CronService->runCli()\\n#13 /var/www/html/owncloud/cron.php(52): OC\\Core\\Service\\CronService->run()\\n#14 {main}\"}}",
    "CustomMessage": "Cron mail sync failed for account 21"
  },
  "id": "6a631cda1e9b3"
}
```

### Mail app version

5.10.9

### Nextcloud version

34.0.2

### Mailserver or service

iCloud

### Operating system

Ubuntu Server

### PHP engine version

Other

### Nextcloud memory caching

_No response_

### Web server

Apache (supported)

### Database

MariaDB

### Additional info

_No response_

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Uh oh!

Error Could not get message flag options from IMAP: IMAP error reported by server. #13350

Steps to reproduce

Expected behavior

Actual behavior

Mail app version

Nextcloud version

Mailserver or service

Operating system

PHP engine version

Nextcloud memory caching

Web server

Database

Additional info

Metadata

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Labels

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Uh oh!

Error Could not get message flag options from IMAP: IMAP error reported by server. #13350

Description

Steps to reproduce

Expected behavior

Actual behavior

Mail app version

Nextcloud version

Mailserver or service

Operating system

PHP engine version

Nextcloud memory caching

Web server

Database

Additional info

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions