python调用smtp发送邮件(多个收件人)

from email import encoders
from email.mime.text import MIMEText
from email.utils import formatdate
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.header import Header
import smtplib

def send_email(file_name):
'''发送测试报告'''
try:
From = "send@xxx.com"
To = "recieved@xx.com,recieved2@xx.com"

    source = '..//Report//' + file_name
    
    server = smtplib.SMTP("smtp.xxx.com") 
    server.login("send@xxx.com","password") #仅smtp服务器需要验证时 
    
    # 构造MIMEMultipart对象做为根容器 
    main_msg = MIMEMultipart() 
    
    # 构造MIMEText对象做为邮件显示内容并附加到根容器 
    text_msg = MIMEText("xx自动化测试报告！") 
    main_msg.attach(text_msg) 
    
    # 构造MIMEBase对象做为文件附件内容并附加到根容器 
    contype = 'application/octet-stream' 
    maintype, subtype = contype.split('/', 1) 
    
    # 读入文件内容并格式化 
    data = open(source, 'rb') 
    file_msg = MIMEBase(maintype, subtype) 
    file_msg.set_payload(data.read( )) 
    data.close( ) 
    encoders.encode_base64(file_msg) 
    
    # 设置附件头 
    basename = os.path.basename(source)
    #解决中文附件名乱码问题 
    file_msg.add_header('Content-Disposition', 'attachment', filename=('gbk', '', basename)) 
    main_msg.attach(file_msg) 
    
    # 设置根容器属性 
    main_msg['From'] = From 
    main_msg['To'] = To 
    main_msg['Subject'] = Header("XX自动化测试报告","utf-8")
    main_msg['Date'] = formatdate( ) 
    
    # 得到格式化后的完整文本 
    fullText = main_msg.as_string( ) 
    
    # 用smtp发送邮件 
    try: 
        server.sendmail(From, To.split(','), fullText) 
    finally: 
        server.quit()
except Exception:
    logger.exception('发送邮件出错！')