import poplib
import email
from base64 import b64decode

pop3_server = 'pop.gmail.com'
pop3_port = '995'
username = 'XXXXXXXXXX@gmail.com'
password = 'XXXXXXXXXXXXXX'

M = poplib.POP3_SSL(pop3_server, pop3_port)
M.user(username)
M.pass_(password)

numMessages = len(M.list()[1])

def decode_header(header):
    decoded_bytes, charset = email.header.decode_header(header)[0]
    if charset is None:
        return str(decoded_bytes)
    else:
        return decoded_bytes.decode(charset)

for i in range(numMessages):
    raw_email  = b"\n".join(M.retr(i+1)[1])
    parsed_email = email.message_from_bytes(raw_email)
    print('=========== email #%i ============' % i)
    print('From:', parsed_email['From'])
    print('To:', parsed_email['To'])
    print('Date:', parsed_email['Date'])
    print('Subject:', decode_header(parsed_email['Subject']))
    for part in parsed_email.walk():
        if part.is_multipart():
            # maybe need also parse all subparts
            continue
        elif part.get_content_maintype() == 'text':
            text = part.get_payload(decode=True).decode(part.get_content_charset())
            print('Text:\n', text)
        elif part.get_content_maintype() == 'application' and part.get_content_disposition() == 'attachment':
            name = decode_header(part.get_filename())
            body = part.get_payload(decode=True)
            size = len(body)
            print('Attachment: "{}", size: {} bytes, starts with: "{}"'.format(name, size, body[:50]))
        else:
            print('Unknown part:', part.get_content_type())
    print('======== email #%i ended =========' % i)