Google does auto delete spam, they just don't do it until a month (i think) after the message arrives. I think that they realize that occasionally they will mi

Google does auto delete spam, they just don't do it until a month (i think) after the message arrives. I think that they realize that occasionally they will miss-classify some mail and at least this way you have a chance to catch it. Not every algorithm is perfect. For instance I received three reminder email to renew my economist subscription the first two were marked important and the third one was spam... who knows why that happened. If spam were auto deleted i would have never known.