Wondering if this is a real thing?
Yes, yes it is.
You probably saw an @libraryofspam.com email address and thought, what the heck is this!? Well, we are an email service provider for users who don't want to receive a lot of unwanted messages. We do some tech magic to make sure our users only receive good stuff. But don't worry, if your message is legitimate, rest assured, it will be delivered. :)
Whether the recipient will reply to you or not, that's up to them!