Can a PHP program recieve an e-mail and write it to a file???

Hey, Here is what I need to do, I need to have a PHP script recieve an e-mail and write it to a file after erasing whatever was in the file before. I suppose that it should have some sort of authentication built in to prevent people from e-mailing PHP code that could be processed and do bad things. Is there any way to do this? Can a PHP script recieve and e-mail? Could the e-mail be written to a mail queue say php-email-processor@domain.com and the script periodically check the mail queue for new e-mail print its contents to a text file somewhere in the serverroot and then erase the mail queue??? Does this sound possibile??? Thanks, Jeremy