Skip to main content

Python script to mail merge with CC

Limitation of normal mail merge is that you can't insert Cc/Bcc fields into it. I have tried to overcome this by writing a small script. The script takes the recipients in To and recipients in Cc fields from an excel sheet. It reads the sheet one by one from both columns and send them emails reading on the contents from an external fields. Yes, it's simple, but what I was trying earlier was something else. I was trying to send 'personalized' emails with 'Cc' field in the mail. But the 'personalized' part is very difficult to implement, as I was not able to write the variable data to the body of the email. So, settled down with this fixed body contents being read from external file. Let me know if anybody is aware of how to send personalized body contents to respective users. I mean the some fields in the body of the mail should on user basis. In this case the body of the mail is general and fixed in nature.

Code to read user lists from excel and send the email inserting Cc field:

import smtplib
import sys
import xlrd
from email.mime.text import MIMEText

def SendEmail(emailTo,CCname):

        # Open the file to read the contents           
        fp = open('C:\.......\mailcontents.txt', 'rb')  
        msg = MIMEText(
        #pouplate the msg container fields
        msg['Subject']= "Test mail!"
        # finally send the email
        s = smtplib.SMTP('')
        s.sendmail(msg['From'], [emailTo,CCname], msg.as_string())

# Open the excelsheet containing mail records such as, To, CC
wb=xlrd.open_workbook ('C:\......\mailRecord.xlsx')
for rownum in range(sh.nrows):
        emailTo=str(sh.cell(rownum,0).value)   # The To field in first coloumn
        CCname=str(sh.cell(rownum,1).value)  #The CC field in second coloumn
        SendEmail(emailTo,CCname)  # Call the function above


Ritesh Sinha said…
Hi Nilesh! Hope you're well. For sending personalised emails you can also do what marketing folks have been doing for ages, use the Mail Merge feature in Microsoft Office. Here's some documentation for Office 2003.

Popular posts from this blog

Ardilla- New tool for finding SQL Injection and XSS

Three Researchers -- MIT's Adam Kiezun , Stanford's Philip Guo , and Syracuse University's Karthick Jayaraman -- has developed a new tool ' Ardilla ' that automatically finds and exploits SQL injection and cross-site scripting vulnerabilities in Web applications. It creates inputs that pinpoint bugs in Web applications and then generates SQL injection and XSS attacks. But for now Ardilla is for PHP -based Web app only. The researchers say Ardilla found 68 never-before found vulnerabilities in five different PHP applications using the tool -- 23 SQL injection and 45 XSS flaws. More information is awaited. For their attack generation techniques refer to their document at:

Combining power of Fiddler with Burp

Both are pretty powerful tools when it comes to intercept and modify http communications. But at some point of time, they become even more powerful combo if tied with each other. They complement each other. In a recent pentest I came across a similar situation where in Burp was not able to intercept a specific kind of traffic and Fiddler came to rescue. The application was designed to upload video. The initial communication was straight forward, I mean logging into application, filling up the video details etc. And all these were easily captured by Burp except the point where you hit the Upload Video and it connects to a different server and surprisingly it was not captured by Burp, not sure why, even after repeated attempts. So, I fired Fiddler to see if the it sees this request. But it's a;ways to play with requests using Burp due to it's various functionalities like, Intruder, Repeaters etc. But it was necessary to capture this request in Burp. So the below steps can be

File Upload through Null Byte Injection

Sometimes, during file upload we come across situation wherein there would be check on the file extension at the client side as well as server side too. If the application does allow only .jpeg extension to be uploaded, the client side java script checks for the extension of the file before passing the request. We all know that how easily this can be defeated. Some applications, checks for the extension at the server side also. That's not easy to bypass. However there are some ways with which it still can be bypassed. Most of server side scripts are written in high level languages such as Php, Java etc who still use some C/C++ libraries to read the file name and contents. That leads to the problem. In C/C++ a line ends with /00 or which is called Null Byte. So whenever the interpreter sees a null byte at the end of the a string, it stops reading thinking it has reached at the end of the string. This can be used for the bypass. It works for many servers, specially php servers. T