WASHINGTON -- Thirty years after delivering thrills to Star Wars fans, R2-D2 is delivering mail.

The brave little droid will be promoting the movie's 30th anniversary for Lucasfilm and a stamp that's being produced in its honor by the Postal Service.

The new stamp will be released March 28.

About 400 mailboxes will be covered to look like R2-D2, which is about the same shape.

Postal officials are warning people looking for souvenirs that it's a crime to tamper with mailboxes, even those in costume.