fix: update @push.rocks/smartproxy to version 19.6.1 and improve socket management in ConnectionManager

feat: enhance MetricsManager with reset interval and top domains tracking

ts/mail/delivery/smtpserver/connection-manager.ts

@@ -247,11 +247,23 @@ export class ConnectionManager implements IConnectionManager {
     
     // 2. Check for destroyed sockets in active connections
     let destroyedSocketsCount = 0;
+    const socketsToRemove: Array<plugins.net.Socket | plugins.tls.TLSSocket> = [];
+    
     for (const socket of this.activeConnections) {
       if (socket.destroyed) {
         destroyedSocketsCount++;
-        // This should not happen - remove destroyed sockets from tracking
-        this.activeConnections.delete(socket);
+        socketsToRemove.push(socket);
+      }
+    }
+    
+    // Remove destroyed sockets from tracking
+    for (const socket of socketsToRemove) {
+      this.activeConnections.delete(socket);
+      // Also ensure all listeners are removed
+      try {
+        socket.removeAllListeners();
+      } catch {
+        // Ignore errors from removeAllListeners
       }
     }
     
@@ -341,9 +353,6 @@ export class ConnectionManager implements IConnectionManager {
       SmtpLogger.debug(`Could not set socket buffer limits: ${error instanceof Error ? error.message : String(error)}`);
     }
     
-    // Track this IP connection
-    this.trackIPConnection(remoteAddress);
-    
     // Set up event handlers
     this.setupSocketEventHandlers(socket);
     
@@ -498,9 +507,6 @@ export class ConnectionManager implements IConnectionManager {
       SmtpLogger.debug(`Could not set socket buffer limits: ${error instanceof Error ? error.message : String(error)}`);
     }
     
-    // Track this IP connection
-    this.trackIPConnection(remoteAddress);
-    
     // Set up event handlers
     this.setupSocketEventHandlers(socket);
     
@@ -763,6 +769,9 @@ export class ConnectionManager implements IConnectionManager {
         clearTimeout(session.dataTimeoutId);
       }
       
+      // Remove all event listeners to prevent memory leaks
+      socket.removeAllListeners();
+      
       // Log connection close with session details if available
       adaptiveLogger.logConnection(socket, 'close', session);
       
@@ -774,6 +783,13 @@ export class ConnectionManager implements IConnectionManager {
       
       // Ensure socket is removed from active connections even if an error occurs
       this.activeConnections.delete(socket);
+      
+      // Always try to remove all listeners even on error
+      try {
+        socket.removeAllListeners();
+      } catch {
+        // Ignore errors from removeAllListeners
+      }
     }
   }