Officials at Yokohama Chuo Post Office sent postcards soliciting part-time workers to some 8,000 people aged 15 to 17 based on a list of those who had postal savings accounts, a move that goes against internal rules, it was learned Sunday.

According to sources close to the case, the post office, located in Nishi Ward, sent postcards to the teenagers notifying them that there were part-time jobs available in connection with the sorting and delivery of next year's New Year's greeting postcards.

Internal rules laid out by the Postal Services Agency bans the use of postal savings customer records for any means other than postal savings business, such as informing clients of the maturity of their deposits. Agency officials said that those involved in the incident would be reprimanded.

Although the part-time jobs were for high school students, some of the postcards were mailed to junior high school students, prompting an inquiry from a parent who thought it strange, according to the sources.