IMAPLIB - få SentTime (eller RecivedTime) for hver mail

Hej,

HVordan hiver jeg SentTime eller RecivedTime ud på hver mail? Jeg vil reelt set gerne døbe filnavnet så den indeholder datostempel...

try:
    imapSession = imaplib.IMAP4_SSL('outlook.office365.com')
    typ, accountDetails = imapSession.login('xxxxxxx\data', 'xxxxxxxx')
    if typ != 'OK':
        print ('Not able to sign in!')
        raise

    imapSession.select('Inbox')
    typ, data = imapSession.search(None, '(UNSEEN FROM "@xxxxx.dk")')
    if typ != 'OK':
        print ('Error searching Inbox.')
        raise

    # Iterating over all emails
    for msgId in data[0].split():
        typ, messageParts = imapSession.fetch(msgId, '(RFC822)')
        if typ != 'OK':
            print ('Error fetching mail.')
            raise

        emailBody = messageParts[0][1]
        mail = email.message_from_string(emailBody)
        for part in mail.walk():
            if part.get_content_maintype() == 'multipart':
                # print part.as_string()
                continue
            if part.get('Content-Disposition') is None:
                # print part.as_string()
                continue
        fileName = part.get_filename().encode('utf-8')