Tankerbuilder, I'm not an admin on these forums, but have moderated forums in the past, and certainly no-one needs to be abused, either publicly on the forum, or privately in their email. There are proper channels in dealing with these miscreants.
Posts have a "Report Abuse" option located in the pull down menu labeled "More". I strongly encourage you to use that option to report this person to the admins. You can even cut and paste the abusive email into the report, as it gives you the option to add your two cents to the report.