python同时给两个收件人发送邮件的方法

import smtplib
import string
host = "localhost"
fromclause = "a@b.com"
toclause = "c@d.com, e@f.com"
toclause = string.splitfields(toclause, ",")
msgbody = """
Test!
Best Regards
"""
SMTPServer = smtplib.SMTP(host)
SMTPServer.sendmail(fromclause, toclause, msgbody)
SMTPServer.quit()