nextcloud / nextcloud/mail

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

Open
#13,350 9 comments 0 reactions 1 assignee View on GitHub

@kesselb is already working on this.

Since Aug 6, 2026.

1. to develop bug
Dominant language
JavaScript
Stars
1k
Forks
348
Avg merge
12h 28m
Merged PRs (30d)
91

Description

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.

{
  "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

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Assessment

This issue has not been assessed yet.

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.