iphone app receive&display an email

Hello, We need an iphone / ipad application to receive and display .pdf content of an email. There are three screens. 1., Main menu. -settings -your mail 2., Settings screen entry box: email address update button 3., Your mail screen -clickable list of received emails with date stamp. Emails comes from a certain domain, disregard all other emails. check mail button: receives and stores email locally. Leaves email on server. If user clicks on any email title, display email content. It is always a pdf attachment.