imap_test.py

#!/usr/bin/env python3
import imaplib, os

# Very simple IMAP client - prints messages in inbox
imap_host = os.getenv('IMAP_HOST')
imap_user = os.getenv('IMAP_USER')
imap_pass = os.getenv('IMAP_PASSWORD')

# connect to host using SSL
imap = imaplib.IMAP4_SSL(imap_host)

## login to server
imap.login(imap_user, imap_pass)
imap.select('Inbox')
print('Reading messages from {} for user {}'.format(imap_host, imap_user))
tmp, data = imap.search(None, 'ALL')
for num in data[0].split():
    tmp, data = imap.fetch(num, '(RFC822)')
    if tmp == 'OK':
        id = ' Message {0} '.format(num.decode('utf-8)'))
        sep = '='
        print(sep * 10 + id + sep *(100-len(id)))
        message = data[0][1].decode('utf-8')
        print(message)
    else:
        print(tmp)
imap.close()

Set up the environment variables before running.