A staffer for Queens Councilman Daneek Miller sent political fund-raising e-mails while working on the taxpayer dime, according to a Miller staffer and a source who shared the e-mail with The Post.

Margaret Denson sent the plea for donations to ex-Councilman Leroy Comrie’s state Senate bid Wednesday. Denson claimed she was in the office but on a lunch break.

“[The city] should investigate it,” said Katherine James, former Board of Elections deputy chief clerk who received the e-mail. “They’re not following the rules.”