[tapoueh]

So that you can receive updates if I make some. You don't have to, though, read http://tapoueh.org/blog/2017/11/mastering-postgresql-in-appl... where you will find the full Table of Contents, or just buy the book ;-)

[alpos]

Best not to sneak an email collection scheme in on people even if it really is only for your newsletter. Most people have more than enough spam in their inbox already, if someone wants to get updates it's very easy for them to just click a button that says "Click here to get updates".

[spacemanmatt]

Email for updates being a foot in the door for further communications is pro forma and legally regulated. I think you're unnecessarily suspicious.