Mail bundling and processing performance improvements

app/Models/System.php

@@ -110,6 +110,7 @@ class System extends Model
 	public function sessions()
 	{
 		return $this->belongsToMany(Zone::class)
+			->select(['id','zones.zone_id','domain_id','active'])
 			->withPivot(['sespass','pktpass','ticpass','fixpass','zt_ipv4','zt_ipv6','default'])
 			->dontCache();
 	}