Be aware that if you get an email from google.com/amp, it could be from a phishing site. Phishers and scammers are using AMP page links to hide their true websites and trick users into clicking their links.
"Many phishers and hackers use URLs like www. google.com.someotherurl.com/blahblah. html to disguise links," according to The SEM Post. Webmasters have been trained to look at the "someotherurl" part of that URL to figure out if the link is real or not. "But now phishers are using google.com AMP URLs to take advantage of people who check specifically for the domain, meaning even tech savvy people could potentially fall victim to these phishing attacks, because they are using Google's own AMP URLs."
At least someone is getting good use out of AMP pages early, I guess? Be careful out there!