使用 SMTP 作为附件发送 PDF 时出错

Question

在运行以下 python 脚本以使用 SMTP 发送 pdf 附件时，遇到 SMTPDataError 异常。我可以使用以下代码将文本或图像文件发送给同一发件人和同一收件人。 pdf 文件大小几乎没有 1 MB。

import smtplib
import email
import email.mime
import email.mime.application

from_email = "XXXX@gmail.com"
from_passwd = ""
to_email = "abc@gmail.com"

message = email.mime.Multipart.MIMEMultipart('mixed')
message['Subject'] = 'Test_run'
message['From'] = from_email
message['To'] = to_email

text_part = email.mime.Text.MIMEText("""This is an e-mail message to be sent in HTML format

<b>This is HTML message.</b>
<h1>This is headline.</h1>

""",'html')
message.attach(text_part)

filename1 = "some_doc.pdf"
fp = open(filename1 , 'rb')
attach_part = email.mime.application.MIMEApplication(fp.read(),"pdf")
fp.close()

attach_part.add_header('Content-Disposition','attachment',filename = "some_doc.pdf")
message.attach(attach_part)

server = smtplib.SMTP("smtp.gmail.com",587)
server.starttls()
server.login(from_email,from_passwd)
server.sendmail(from_email,to_email,message.as_string())

server.close()  

遇到的错误信息

File "/usr/lib/python2.7/smtplib.py", line 746, in sendmail
    raise SMTPDataError(code, resp)
smtplib.SMTPDataError: (550, '5.7.1 The user or domain that you are sending to (or from) has a policy that\n5.7.1 prohibited the mail that you sent. Please contact your domain\n5.7.1 administrator for further details. For more information, please visit\n5.7.1  https://support.google.com/a/answer/172179 66sm37804549pfx.29 - gsmtp')

非常感谢任何帮助。

Answer 1

您是否尝试将 PDF 发送给不同域中的不同收件人？或者向同一收件人发送类似大小的图像？

听起来这个域可能不允许 pdf 附件，无论出于何种原因...