import imaplib
import email


MAIL_HOSTNAME = ''
MAIL_USERNAME = ''
MAIL_PASSWORD = ''


def main():
    imap = imaplib.IMAP4(MAIL_HOSTNAME)
    imap.login(MAIL_USERNAME, MAIL_PASSWORD)
    imap.select()

    _, msg_ids = imap.search(None, 'ALL')
    for msg_id in msg_ids[0].split():
        _, data = imap.fetch(msg_id, 'RFC822')
        msg = email.message_from_bytes(data[0][1])
        print(msg['Subject'])


if __name__ == '__main__':
    main()