Mac: Why is my text running off to the right of my article section?

Text extending beyond an article block is a result of pasting text from external sources (MS Word document, email message, webpage, etc.) into Benchmark Email. One solution is to copy text from the original source, paste it to a simple text program (not MS Word or Apple Pages) so that it loses its formatting, then to recopy the text and paste it into the Benchmark Email editor. Your computer most