Here are a few examples.
http://en.wikipedia.org/wiki/Table_of_contents
http://en.wikipedia.org/wiki/Table_of_contents#Examples
http://en.wikipedia.org/wiki/Table_of_contents#References
So for you, it might be
http://yourblog.com/article.htm
http://yourblog.com/article.htm#Section1
http://yourblog.com/article.htm#Section2
etc
But for it to work, on the web page http://yourblog.com/article.htm you need to have anchor tags in the html appropriately.
Such as
<a name="Section1">Section 1</a>
<a name="Section2">Section </a> etc at appropriate places.
More info,
http://stackoverflow.com/questions/11994834/the-anchor-top-on-subpages-send-to-index-page
Also wanted to mention, Anchor tags are not fully supported by all email clients. This means that after all your hard work of coding and formatting your newsletter, recipients may end up with broken anchor tags.
Some of the more popular email clients, including Outlook 2003, Express, Hotmail, and Yahoo! Mail, support anchors for the most part. Those that did not support the anchor tags were Gmail, AOL Mail, and Android 2.3.
Hope this helps
Rajesh