在exchangelib中发件人和作者之间有什么区别？

Question

代码

#!/usr/bin/env python
from exchangelib import ServiceAccount, Configuration, Account, DELEGATE

import os
import logging
from config import cfg
logging.basicConfig()

credentials = ServiceAccount(username=cfg['imap_user'],
                             password=cfg['imap_password'])

config = Configuration(server=cfg['imap_server'], credentials=credentials)
account = Account(primary_smtp_address=cfg['smpt_address'], config=config,
                  autodiscover=False, access_type=DELEGATE)
unread = account.inbox.filter(is_read=False)   # returns unread emails
for msg in unread:
    print("last_modified_time={}".format(msg.last_modified_time))
    print("datetime_sent     ={}".format(msg.datetime_sent))
    print("#" * 80)

给我输出

author            =Mailbox('Martin Thoma', 'martin.thoma@abc.def', 'OneOff', None)
sender            =Mailbox('Martin Thoma', 'martin.thoma@abc.def', 'OneOff', None)
################################################################################
author            =Mailbox('Martin Thoma', 'info@hij.klm', 'OneOff', None)
sender            =Mailbox('Martin Thoma', 'info@hij.klm', 'OneOff', None)
################################################################################

author和sender是否始终相同？