代码

import smtplib
import socket
from email.mime.text import MIMEText
from email.header import Header

def send_mail():
    # 设置发件人、收件人、主题、内容
    from_address = '18847097110@163.com'
    to_address = '963268595@qq.com'
    subject = 'test email'
    body = 'hahahhahaha'

    # SMTP邮件服务器
    smtp_server = 'smtp.163.com'
    smtp_port = 25

    # 发件人账号和密码
    username = '18847097110@163.com'
    password = 'your password'

    # 创建邮件内容
    msg = MIMEText(body, 'plain', 'utf-8')
    msg['From'] = from_address
    msg['To'] = to_address
    msg['Subject'] = Header(subject, 'utf-8')

    server = None  # 初始化 server

    try:
        # 检查端口是否通畅
        sock = socket.create_connection((smtp_server, smtp_port), timeout=5)
        sock.close()

        # 连接邮件服务器并发送邮件
        server = smtplib.SMTP(smtp_server, smtp_port)
        server.login(username, password)
        server.sendmail(from_address, to_address, msg.as_string())
        print('Email send successfully!')
   #捕获socket的error
    except socket.error as e:
        print('Socket error occurred:', e)
   #捕获smtplib的error
    except smtplib.SMTPException as e:
        print('SMTP error occurred:', e)
   #捕获任何类型的异常
    except Exception as e:
        print('An error occurred:', e)
   #无论是否发生异常，此模块下的代码都会执行
    finally:
        if server is not None:
            server.quit()

if __name__ == '__main__':
    send_mail()

返回

捕获异常

将端口修改成一个错误的端口，会提示报错  连接端口失败

        

填写一个错误的账号或者是密码，会提示认证失败