I am trying to find a way to embed a share/+1 link for Google+ in a Newsletter, much like the Facebook share and tweeter tweet links can be embedded in a newsletter, which c
The share link allows you to do this. It will work in an email, but it's not quite the same as the +1 button.
To use the share link, add a link element to your email that complies with the Google+ Buttons policy. Set the href attribute to https://plus.google.com/share?url={url encoded share target}
For example, linking to https://plus.google.com/share?url=http%3A%2F%2Fexample.com will allow you to share example.com on Google+: (yes, that is a working demo).
Check out the official docs for more info.
If you use this approach please be aware of the fact that it is not a direct replacement for the +1 button. The link shares the target URL on Google+, but it does not actually +1 the target page. Only the +1 button can +1 a page.