All these errors are reported in Webmaster Tools in the Diagnostics section. Verify your site and you'll have access to this and a wealth of more data.
Also, we do send notifications in Webmaster Tools, and you can confgure those to be delivered by email too. I'm not sure if we send messages for these kinds of serious crawl errors, so I'll need to check. If not, that's an interesting idea I can ask the team to think about.