python調用smtp發送郵件(多個收件人)

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):
'''發送測試報告'''
try:
From = "[e-mail]"
To = "[e-mail],[e-mail]"

    source = '..//Report//' + file_name
    
    server = smtplib.SMTP("smtp.xxx.com") 
    server.login("[e-mail]","password") #僅smtp服務器需要驗證時 
    
    # 構造MIMEMultipart對象做為根容器 
    main_msg = MIMEMultipart() 
    
    # 構造MIMEText對象做為郵件顯示內容並附加到根容器 
    text_msg = MIMEText("xx自動化測試報告！") 
    main_msg.attach(text_msg) 
    
    # 構造MIMEBase對象做為文件附件內容並附加到根容器 
    contype = 'application/octet-stream' 
    maintype, subtype = contype.split('/', 1) 
    
    # 讀入文件內容並格式化 
    data = open(source, 'rb') 
    file_msg = MIMEBase(maintype, subtype) 
    file_msg.set_payload(data.read( )) 
    data.close( ) 
    encoders.encode_base64(file_msg) 
    
    # 設置附件頭 
    basename = os.path.basename(source)
    #解決中文附件名亂碼問題 
    file_msg.add_header('Content-Disposition', 'attachment', filename=('gbk', '', basename)) 
    main_msg.attach(file_msg) 
    
    # 設置根容器屬性 
    main_msg['From'] = From 
    main_msg['To'] = To 
    main_msg['Subject'] = Header("XX自動化測試報告","utf-8")
    main_msg['Date'] = formatdate( ) 
    
    # 得到格式化后的完整文本 
    fullText = main_msg.as_string( ) 
    
    # 用smtp發送郵件 
    try: 
        server.sendmail(From, To.split(','), fullText) 
    finally: 
        server.quit()
except Exception:
    logger.exception('發送郵件出錯！')