from_addr = email.utils.getaddresses([from_addr])[0][1]，使用python发送电子邮件时出错

import re

def is_valid_email(email):
    pattern = r'^[\w\.-]+@[\w\.-]+\.\w+$'
    return re.match(pattern, email) is not None

from_addr = "example@example.com"
if not is_valid_email(from_addr):
    print("Invalid email address: " + from_addr)
    # 这里可以返回错误信息或采取其他操作

import email

import smtplib
from email.mime.text import MIMEText

# 配置SMTP服务器信息
smtp_server = "smtp.example.com"
smtp_port = 587
smtp_username = "your_username"
smtp_password = "your_password"

# 构造邮件内容
msg = MIMEText("Hello, this is a test email.")
msg["Subject"] = "Test Email"
msg["From"] = from_addr
msg["To"] = "recipient@example.com"

# 连接SMTP服务器并发送邮件
try:
    with smtplib.SMTP(smtp_server, smtp_port) as smtp:
        smtp.starttls()
        smtp.login(smtp_username, smtp_password)
        smtp.send_message(msg)
    print("Email sent successfully.")
except Exception as e:
    print("Failed to send email:", str(e))