Unless you use an attachment that allows you to apply size restrictions, there is very little you can do with emails since, even if you were to use an email client that supports such a feature, you'd still be at the mercy of whatever email clients your recipients use. Even fixed-size cells are only of limited benefit if your recipients can change the font and/or point size. Ultimately, unless you're prepared to go to the effort of setting up an on-line input form, you're probably better off just giving the users a word limit and letting them email their responses back to you.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]