如何在Python中为邮件添加.jpeg或PDF格式的附件？

你的代码已经能正常发送纯文本邮件，只需添加附件处理逻辑即可，使用EmailMessage的add_attachment方法就可以实现，无需依赖过时的MIMEMultipart类。以下是修改后的完整代码：

import os
from email.message import EmailMessage
import ssl
import smtplib

email_sender = 'Example@gmail.com'
Password = 'gmail app password'
email_receiver = 'Example@gmail.com'
subject = 'message subject'
body = 'message body text'

em = EmailMessage()
em['From'] = email_sender
em['To'] = email_receiver
em['Subject'] = subject
em.set_content(body)

# 处理附件
attachment_path = "你的完整附件路径（比如./report.pdf）"
attachment_filename = os.path.basename(attachment_path)

# 读取附件内容
with open(attachment_path, 'rb') as f:
    file_data = f.read()
    # 获取文件后缀作为子类型，无后缀则用通用二进制类型
    file_ext = os.path.splitext(attachment_path)[1].strip('.')
    file_subtype = file_ext if file_ext else 'octet-stream'

# 添加附件到邮件
em.add_attachment(
    file_data,
    maintype='application',  # 通用二进制类型主类型，若为图片可改为'image'
    subtype=file_subtype,
    filename=attachment_filename
)

context = ssl.create_default_context()
with smtplib.SMTP_SSL('smtp.gmail.com', 465, context=context) as smtp:
    smtp.login(email_sender, Password)
    smtp.sendmail(email_sender, email_receiver, em.as_string())

关键说明： #

• 替换attachment_path为你的实际附件路径，确保文件存在且路径正确
• 如果添加图片附件，可将maintype改为'image'，subtype对应'png'或'jpg'等
• 如需添加多个附件，重复执行「读取文件+add_attachment」的逻辑即可
• 确认Gmail应用密码有效，账号需开启两步验证后生成专用应用密码

内容的提问来源于stack exchange，提问作者RonaldHucklebee