And they aren't really NON-standard. All headers beginning with "X-" are allowed specifically by the standard, with the usage and semantics to be agreed upon by the community involved. That's why when MS wanted a *user-to-user* indicator of priority, they avoided the earlier X-Priority: header and set up a distinct one for their own "community" of Outlook users.
Excellent commentary. Thanks.
-- Rodolfo J. Paiz rpaiz@xxxxxxxxxxxxxx http://www.simpaticus.com
