如何在使用Python的smtplib发送的电子邮件中获得换行符？

Question

我编写了一个脚本，该脚本将消息写到文本文件，然后将其作为电子邮件发送。一切都进行得很好，除了电子邮件最终似乎全部合而为一。

我添加了换行符\n，它适用于文本文件，但不适用于电子邮件。您知道可能是什么原因吗？

这是我的代码：

import smtplib, sys
import traceback
def send_error(sender, recipient, headers, body):

    SMTP_SERVER = 'smtp.gmail.com'
    SMTP_PORT = 587
    session = smtplib.SMTP('smtp.gmail.com', 587)
    session.ehlo()
    session.starttls()
    session.ehlo
    session.login(sender, 'my password')
    send_it = session.sendmail(sender, recipient, headers + "\r\n\r\n" +  body)
    session.quit()
    return send_it


SMTP_SERVER = 'smtp.gmail.com'
SMTP_PORT = 587
sender = '[e-mail]'
recipient = '[e-mail]'
subject = 'report'
body = "Dear Student, \n Please send your report\n Thank you for your attention"
open('student.txt', 'w').write(body)

headers = ["From: " + sender,
               "Subject: " + subject,
               "To: " + recipient,
               "MIME-Version: 1.0",
               "Content-Type: text/html"]
headers = "\r\n".join(headers)
send_error(sender, recipient, headers, body)

Answer 1

您已声明消息正文具有HTML内容（"Content-Type: text/html"）。换行符的HTML代码是<br>。您应该将内容类型更改为，text/plain或者将HTML标记用于换行符，而不要使用纯\n文本，因为纯文本在呈现HTML文档时会被忽略。

作为附带说明，也请查看电子邮件包。有一些类可以为您简化电子邮件的定义（带有示例）。

例如，您可以尝试（未试用）：

import smtplib
from email.mime.text import MIMEText

# define content
recipients = ["[e-mail]"]
sender = "[e-mail]"
subject = "report reminder"
body = """
Dear Student,
Please send your report
Thank you for your attention
"""

# make up message
msg = MIMEText(body)
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = ", ".join(recipients)

# sending
session = smtplib.SMTP('smtp.gmail.com', 587)
session.starttls()
session.login(sender, 'my password')
send_it = session.sendmail(sender, recipients, msg.as_string())
session.quit()