python发送邮件报554, b"5.2.0 STOREDRV.Submission.Exception:InvalidRecipientsException;

霍格沃兹测试学院校内交流
1 
try:
    smtpObj = smtplib.SMTP(mail_host, 587)
    #smtpObj.connect(mail_host, port=587)
    smtpObj.starttls()
    smtpObj.set_debuglevel(1)
    #smtpObj.ehlo()
    smtpObj.login(mail_user, mail_pass)
    smtpObj.sendmail(sender, receivers, message.as_string())
    print("邮件发送成功")
    smtpObj.quit()
except smtplib.SMTPException as e:
    print(e)

发送邮件会报错，麻烦大神指点一下：
(554, b"5.2.0 STOREDRV.Submission.Exception:InvalidRecipientsException; Failed to process message due to a permanent exception with message Recipient ‘’ is not resolved. All recipients must be resolved before a message can be submitted. InvalidRecipientsException: Recipient ‘’ is not resolved. All recipients must be resolved before a message can be submitted. [Hostname=SH0PR01MB0892.CHNPR01.prod.partner.outlook.cn]")

2

这句话是说你收件人的解析有问题，你看下收件人那部分代码吧