update

ts/mail/delivery/classes.delivery.queue.ts

@@ -613,6 +613,12 @@ export class UnifiedDeliveryQueue extends EventEmitter {
     // Stop processing
     this.stopProcessing();
     
+    // Clear the check timer to prevent memory leaks
+    if (this.checkTimer) {
+      clearInterval(this.checkTimer);
+      this.checkTimer = undefined;
+    }
+    
     // If using disk storage, make sure all items are persisted
     if (this.options.storageType === 'disk') {
       const pendingWrites: Promise<void>[] = [];

ts/mail/delivery/classes.unified.rate.limiter.ts

@@ -146,6 +146,35 @@ export class UnifiedRateLimiter extends EventEmitter {
     }
   }
   
+  /**
+   * Destroy the rate limiter and clean up all resources
+   */
+  public destroy(): void {
+    // Stop the cleanup interval
+    this.stop();
+    
+    // Clear all maps to free memory
+    this.counters.clear();
+    this.ipCounters.clear();
+    this.patternCounters.clear();
+    
+    // Clear blocks
+    if (this.config.blocks) {
+      this.config.blocks = {};
+    }
+    
+    // Clear statistics
+    this.stats = {
+      activeCounters: 0,
+      totalBlocked: 0,
+      currentlyBlocked: 0,
+      byPattern: {},
+      byIp: {}
+    };
+    
+    logger.log('info', 'UnifiedRateLimiter destroyed');
+  }
+  
   /**
    * Clean up expired counters and blocks
    */