10 e-Newsletter Best Practices for Nonprofits
http://www.nptechforgood.com/2014/09/28/10-e-newsletter-best-practices-for-nonprofits/
5 Simple Strategies to Improve Your Email Open Rate
http://blogs.constantcontact.com/improve-email-open-rates/
10 Things to Avoid in Email Newsletter
http://support.e2ma.net/Resource_Center/Help_articles/10-things-to-avoid-in-email-newsletters
This is the Way to Write Email Subject Lines That Get More Clicks
http://coschedule.com/blog/email-subject-lines/
Improve Your Open Rates With These 12 Subject Line Tweaks
http://blogs.constantcontact.com/good-email-subject-lines/
11 Major Reasons Why Your Emails Could Land in the SPAM Box
https://sumome.com/stories/avoid-spam-box?src=sumome-email-story-avoid-spam-box