使用Python smtplib发送邮件时附件文件名默认显示为noname问题求助

问题出在你设置附件头的代码行上，你写错了HTTP头的名称：

payload.add_header('Content-Decomposition', 'attachment', filename=attach_file_name)

正确的头应该是Content-Disposition，而非Content-Decomposition。修改这一行即可让收件箱正确识别附件文件名。

修改后的完整代码片段：

#The body and the attachments for the mail
message.attach(MIMEText(mail_content, 'plain'))
attach_file_name = 'temp.txt'
attach_file = open(attach_file_name, 'rb') # Open the file as binary mode
payload = MIMEBase('application', 'octate-stream')
payload.set_payload((attach_file).read())
encoders.encode_base64(payload) #encode the attachment
#add payload header with filename
payload.add_header('Content-Disposition', 'attachment', filename=attach_file_name)
message.attach(payload)

#Create SMTP session for sending the mail
session = smtplib.SMTP('-----', 587) #custom domain
session.starttls() #enable security
session.login(sender_address, sender_pass) #login with mail_id and password
text = message.as_string()
session.sendmail(sender_address, receiver_address, text)
session.quit()
print('Mail Sent')

如果后续需要处理包含中文的文件名，可以用email.header模块进行编码，示例如下：

from email.header import Header
payload.add_header('Content-Disposition', 'attachment', filename=('utf-8', '', attach_file_name))

内容的提问来源于stack exchange，提问作者Tory