The new "E" stamp works fine on domestic mail but cannot be used for international correspondence, Salt Lake postal officials say.

At least 100 letters a day are being returned from foreign countries to Salt Lake residents because the new "E" stamp has been used instead of stamps or metered labels showing actual denominations.Salt Lake postal officials say international postal regulations require that stamps on foreign mail have numerical denominations printed on them.

Stamps of 25-cent denomination are available at post offices, or 1- and 2-cent stamps can be used with the old 22-cent first class stamps.

Local postal officials said their supplies of the "E" stamp should be exhausted about the end of July.