A website that can extract many different sorts of information pertaining to IP addresses and networks, least of all querying several dozen blacklists to see if an address has been flagged as a spammer's.
Harakiri Mail is an online service which allows anyone to create disposable e-mail addresses which are deleted after 24 hours. You can view the message with a web browser, walk away, and never worry about the address again. They have browser extensions which automate the process somewhat if you have great need for lots of disposable addresses.
Each disposable inbox has its own RSS feed: https://harakirimail.com/rss/username