diff --git a/lib/BackgroundJob/SyncJob.php b/lib/BackgroundJob/SyncJob.php
index e3c1676271..52af3f345f 100644
--- a/lib/BackgroundJob/SyncJob.php
+++ b/lib/BackgroundJob/SyncJob.php
@@ -32,6 +32,7 @@ class SyncJob extends TimedJob {
 	private IUserManager $userManager;
 	private IJobList $jobList;
 	private readonly bool $forcedSyncInterval;
+	private readonly bool $forcedSkip;
 
 	public function __construct(
 		ITimeFactory $time,
@@ -51,7 +52,14 @@ public function __construct(
 		$configuredSyncInterval = $config->getSystemValueInt('app.mail.background-sync-interval');
 		if ($configuredSyncInterval > 0) {
 			$this->forcedSyncInterval = true;
+			$this->forcedSkip = false;
 		} else {
+			if ($configuredSyncInterval === -1) {
+				$this->forcedSkip = true;
+			} else {
+				$this->forcedSkip = false;
+			}
+
 			$this->forcedSyncInterval = false;
 			$configuredSyncInterval = self::DEFAULT_SYNC_INTERVAL;
 		}
@@ -65,6 +73,10 @@ public function __construct(
 	 */
 	#[\Override]
 	protected function run($argument) {
+		if ($this->forcedSkip) {
+			return;
+		}
+
 		$accountId = (int)$argument['accountId'];
 
 		try {