Should MHonArc handle this From line?

Here's a really bad from line that wreaks havoc with my (table-based) index
file:

<!--X-From: =?ISO-2022-JP?B?GyRCJF4kRCQ3JD8kXiQzJEgbKEI=?= 
<matusita(_at_)ics(_dot_)es(_dot_)osaka-u(_dot_)ac(_dot_)jp>  -->

I realize that I could simply limit the length of the line, but this seems
like a MIME thing and thus something that might be in MHonArc's domain.

 - J<