Hi -

The standard recipe for mayo contains NO milk products.  Mayo-lke
(try again) Mayo-LIKE products, such as Miracle Whip, may have
milk products, but straight mayo shouldn't.

If you are worried about cross-contamination, however, and do not
live in an area where it's easy to get kosher products, you may wish
to make your own.  Any good cookbook will give you the recipe.  It's
not so hard to make, although if you aren't experienced as a cook it
may take you a couple of tries to get it right.  Home-made mayo, by
the way, doesn't last long.  The components separate (back into eggs
and oil).

I hope this helps,
--Beth Kevles
  [log in to unmask]
  http://web.mit.edu/kevles/www/nomilk.html -- a page for the milk-allergic
  Disclaimer:  Nothing in this message should be construed as medical
  advice.  Please consult with your own medical practicioner.