Mail recipients complain text doesn't wrap in my messages.

[Prez of Ozark Blues Society]

Is there an Options setting that will help receipients of my emails have the
text wrap when they open my messages? I send out a weekly newsletter in html
format that has both long text paragraphs in it and graphics. I have several
recipients who complain that my text paragraphs stay in one line and go off
the "page" i.e., the message window. My WYSIWYG shows my text is wrapping,
but it doesn't wrap with certain recipients.

Is there a setting I can use? I don't want to ask them to have to change
their settings, since I want it to be easy for them to receive my newsletter.

Thanks!