🚀 go-pugleaf

I am writing a modification to the LaTeX letter style to use with my
letterhead. In this style, I want a variable-sized header on the first
page (the size depends on whether the person defines a telephone number,
FAX number, e-mail address, etc. It is to be just the height necessary
for all the return-address info the person includes). Thus, I want
a routine that will fire at \begin{letter} and reset the \headheight,
\textheight, and \headsep, and will reset these parameters at the
end of the first page.

I have kludged my way around the problem, but I'd like an elegant way
to do this. Has anyone done something like this or have any ideas?

---Jon