One other simple thing that can be done is to apply validation to the forms to make sure your visitors can only input what is needed and/or wanted.
A surprisingly overlooked mistake is to not set a maxlength value to your input boxes. The likelyhood of accidently excluding someone who has an email address of over 40-50 characters is pretty small.
<input type="text" name="MAILFROM" VALUE=""
maxlength="40" size="20">
Eric
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