发送多个收件人的电子邮件问题

Question

我尝试使用此方法向多个收件人发送电子邮件，但是它不起作用，只有列表中的第一个收件人会收到该电子邮件。可能是什么问题？

预先感谢， 劳力

 import smtplib
 import email
 import datetime as dt
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
 from email.mime.base import MIMEBase
 from email import encoders


 recipients = ['x@gmail.com', 'y@gmail.com']
 fromaddr = "a@gmail.com"
 pwd='xxx'
 file= "asdf.pdf"
 now = dt.datetime.now()
 now = dt.date.strftime(now, '%Y-%m-%d')

 msg = MIMEMultipart()

 msg['From'] = fromaddr
 msg['To'] =  ', '.join(recipients)
 msg['Subject'] = "Global Market Overview"

 body = "Daily Report of: " + now

 msg.attach(MIMEText(body, 'plain'))

 filename = "Global Market Overview.pdf"
 attachment = open("Global Market Overview.pdf", "rb")

 part = MIMEBase('application', 'octet-stream')
 part.set_payload((attachment).read())
 encoders.encode_base64(part)
 part.add_header('Content-Disposition', "attachment; filename= %s" % filename)

 msg.attach(part)

 server = smtplib.SMTP('smtp.gmail.com', 587)
 server.starttls()
 server.login(fromaddr, pwd)
 text = msg.as_string()
 server.sendmail(fromaddr, toaddr, text)
 server.quit()
 print('Email sent')