Clipart Illustration of a Mailbox with Letters Inside http://www.iclipart.com/search.php?keys=182357&id=198 Surfdoggie's Review: Clipart picture showing a mailbox with letters inside and the flag up. This is a color clipart image that shows a rural type mailbox with letters and envelopes inside and the red flag is up to notify the mailman there is mail in the mailbox. Please visit the link above to find out how you may use these images. You may need to pay for use of the images or abide by certain licensing restrictions. deliver, delivery, envelope, envelopes, flag up, letter, letters, mail, mailbox, mailbox with flag up, mailbox with the flag up, mailboxes, postal, postal service, red flag, rural mailbox