Python3 Pytracking 像素数据收集未显示

Question

我正在编写一个小脚本来发送电子邮件，我想使用 python 模块 pytracking 跟踪谁打开了电子邮件，如下所示：

import smtplib
import pytracking
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
fromaddr = "info@XXXXXXXXXX.com"
toaddr = "XXXXXXXXa@gmail.com"
msg = MIMEMultipart()
#Not sure if this is the right location for the pixel
pixel= (pixel_byte_string, mime_type) = pytracking.get_open_tracking_pixel()
msg['From'] = fromaddr
msg['To'] = toaddr
msg['Subject'] = "grande"
body = "bla bla bla"
msg.attach(MIMEText(body, 'plain'))

server = smtplib.SMTP('mail.XXXXXXXX.com', 587)
server.ehlo()
server.starttls()
server.ehlo()
server.login('info@XXXXXXXX.com','XXXXXXXX')
text = msg.as_string()
server.sendmail(fromaddr, toaddr, text)
print('DONE')

我在这里阅读了该模块的完整文档，但我找不到从哪里实际检查像素是否已打开或运行哪个命令 shell 来执行此操作。

谁能建议如何检查像素是否已打开？谢谢