smtplib.SMTPDataError: (550, b'2efb645ddd8af6f-15f8b Mail rejected')

[Ezj-Amon]

taskMsg="任务人：xx\n任务类别：任务闭环\n任务派发时间：2023-05-11 17:18:12\n任务内容： 110kV昌教站。 配合#1、#2主变保护装置升级，保护装置模型改变，需重启远动机。",

yag.send(to='[email protected]', subject="test", contents="taskMsg"])
I want to send this message to my email, but it reported an error. I have added my email to the whitelist, but it doesn't seem to work either. Is there a solution?

smtplib.SMTPDataError: (550, b'2efb645ddd8af6f-15f8b Mail rejected')