IMAP

import os,email,imaplib,socket,requests,logging,http.client
mail_user = os.environ.get('MAIL_USER')
mail_password = os.environ.get('MAIL_PASS')
mail_server = os.environ.get('MAIL_SERVER')
detach_dir = '.'
if mail_user is None or mail_password is None or mail_server is None:
    print ('VARIABILI DI AMBIENTE NON DEFINITE')
    exit(1)
try:
    with imaplib.IMAP4_SSL(mail_server) as m:
        try:
            m.login(mail_user,mail_password)
            m.select("INBOX")
            resp, items = m.search(None, "UNSEEN")
            items = items[0].split()
            for emailid in items:
                resp, data = m.fetch(emailid, "(RFC822)")
                email_body = data[0][1] # getting the mail content
                mail = email.message_from_bytes(email_body) # parsing the mail content to get a mail object
                if mail.get_content_maintype() != 'multipart':
                    continue
                for part in mail.walk():
                    if part.get_content_maintype() == 'multipart':
                        continue
                    if part.get('Content-Disposition') is None:
                        continue
                    filename = part.get_filename().lower()
                    if filename.endswith('.xlsx'):
                        att_path = os.path.join(detach_dir, filename)
                        fp = open(att_path, 'wb')
                        fp.write(part.get_payload(decode=True))
                        fp.close()
        except imaplib.IMAP4_SSL.error as e:
            print (e)
            print ("ERRORE")
            exit(1)
except imaplib.IMAP4.error:
    print ("Errore di connessione al server")
    exit(1)