Abstract: A mailbox signalling apparatus for rural-type mailboxes to indicate when a mailbox has been serviced. The signalling apparatus comprises a base for supporting a mailbox, a first indicator member support means on the base for supporting an indicator member toward the front end of the mailbox, a second indicator member support means on the base for supporting an indicator member toward the back end of the mailbox, an indicator member selectively supported by one of the first or second indicator member support means for movement between a first, stand-by position and a second, signalling position, and actuating means on the base for actuating the indicator member for movement from the first, stand-by position to the second, signalling position when the mailbox is opened.