Why does Gmail hate my domain? | https://news.ycombinator.com/item?id=9855030
How to Avoid Spam Filters | https://news.ycombinator.com/item?id=10465639
Hotmail | https://news.ycombinator.com/item?id=14210939
ESP | https://news.ycombinator.com/item?id=14201704
If there are others I'd appreciate a link as I try to connect them!