以下是具体代码，运行的时候显示报错如下，不知怎么处理，希望各位大家帮忙解决下，谢谢！

Traceback (most recent call last):
  File "C:/Users/Administrator/OneDrive/2018/Desktop/WorkStation/Email/Email - 副本.py", line 39, in <module>
    sendmail(from_email,password,to_email,'testing','How are you!')
  File "C:/Users/Administrator/OneDrive/2018/Desktop/WorkStation/Email/Email - 副本.py", line 20, in sendmail
    server.starttls()
  File "C:\Users\Administrator\Anaconda3\lib\smtplib.py", line 749, in starttls
    self.ehlo_or_helo_if_needed()
  File "C:\Users\Administrator\Anaconda3\lib\smtplib.py", line 603, in ehlo_or_helo_if_needed
    raise SMTPHeloError(code, resp)
smtplib.SMTPHeloError: (501, b'5.5.4 Invalid domain name [HK2PR03CA0047.apcprd03.prod.outlook.com]')

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

def sendmail(from_email, password, to_email, subject, message):
    msg = MIMEMultipart()
    msg['From'] = from_email
    msg['To'] = to_email
    msg['Subject'] = subject

    # add in the message body
    msg.attach(MIMEText(message, 'plain'))

    server = smtplib.SMTP('smtp.office365.com', 587)
    server.starttls()
    server.ehlo()
    server.login(msg['From'], password)
    server.sendmail(msg['From'], msg['To'], msg.as_string())
    server.close()

if __name__ == '__main__':
    from_email = "xxx@consult.com"
    password = "xxxxxxpass"
    to_email = '27573xxx@qq.com'
    sendmail(from_email,password,to_email,'testing','How are you!')