There is no input mask that will work for all postal codes. Either trust
the user, or write code to validate what the user has typed (taking into
account international addresses etc.). There's informatoin on postal
codes at http://www.columbia.edu/kermit/postal.html , and a
general-purpose validation function with postal code examples at http://www.mvps.org/access/modules/mdl0063.htm
See also my post just now under the subject "Insert Dashes".
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