我用下面代码试图发送邮件到126邮箱失败，请问是什么原因
import smtplib
from email import encoders
from email.header import Header
from email.mime.text import MIMEText
from email.utils import parseaddr
from email.utils import formataddr
def format_addr(s):
name, addr = parseaddr(s)
return formataddr((Header(name, "utf-8").encode(), addr))
from_email = "[email protected]"
from_email_pwd = "xxxxxxx"
to_email = "[email protected]"
smtp_server = "smtp.126.com"
msg = MIMEText("<html><body><h3>hello</h3><p>hello, send by python</p></body></html>", "html", "utf-8")
msg["From"] = format_addr("%s" %(from_email))
msg["To"] = format_addr("%s" %(to_email))
msg["Subject"] = Header("python email", "utf-8").encode()
server = smtplib.SMTP(smtp_server, 25)
server.set_debuglevel(1)
server.login(from_email, from_email_pwd)
server.sendmail(from_email, [to_email], msg.as_string())
server.quit()
提示错误：
TimeoutError: [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
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