count number of emails sent using smtplib python

Question

I have a basic python code that sends out an email to addresses from a list in Google sheet.

I want to count the number of times an email is sent to a particular email address by the python script. I tried researching on it. I didn't find anything related to it. And being a complete beginner hasn't helped me make much progress.

If anyone can point me to a particular direction that would be super helpful. Thanks so much in advance. 

Below is the code

import smtplib
import ssl
from email.mime.text import MIMEText  # New line
from email.utils import formataddr  # New line

# User configuration
sender_email = 'email ID'
sender_name = 'name'
password = "password"

receiver_emails = [RECEIVER_EMAIL_1, RECEIVER_EMAIL_2, RECEIVER_EMAIL_3]
receiver_names = [RECEIVER_NAME_1, RECEIVER_NAME_2, RECEIVER_NAME_3]

# Email text
email_body = '''
    This is a test email sent by Python. Isn't that cool?
'''

for receiver_email, receiver_name in zip(receiver_emails, receiver_names):
    print("Sending the email...")

    # Configurating user's info
    msg = MIMEText(email_body, 'plain')
    msg['To'] = formataddr((receiver_name, receiver_email))
    msg['From'] = formataddr((sender_name, sender_email))
    msg['Subject'] = 'Hello, my friend ' + receiver_name

    try:
        # Creating a SMTP session | use 587 with TLS, 465 SSL and 25
        server = smtplib.SMTP('smtp.gmail.com', 587)
        server.ehlo()
        # Encrypts the email
        context = ssl.create_default_context()
        server.starttls(context=context)
        # We log in into our Google account
        server.login(sender_email, password)
        # Sending email from sender, to receiver with the email body
        server.sendmail(sender_email, receiver_email, msg.as_string())
        print('Email sent!')

    except Exception as e:
        print(f'Oh no! Something bad happened!n {e}')

    finally:
        print('Closing the server...')
        server.quit()

Answer 1

I would suggest you to create a list of successful emails, which will be populated on each iteration and then, use Counter from collections module, which receives an iterable and returns an object with number of occurrences of each element in the iterable. You can try the following code:

from collections import Counter
import json

counter_file_path = "counter.json"
try:
    with open(counter_file_path, "r") as f:
        email_stats = json.load(f)
except FileNotFoundError as ex:
        email_stats = {}

successful_emails = []
for receiver_email, receiver_name in zip(receiver_emails, receiver_names):
    print("Sending the email...")

    # Configurating user's info
    msg = MIMEText(email_body, 'plain')
    msg['To'] = formataddr((receiver_name, receiver_email))
    msg['From'] = formataddr((sender_name, sender_email))
    msg['Subject'] = 'Hello, my friend ' + receiver_name

    try:
        # Creating a SMTP session | use 587 with TLS, 465 SSL and 25
        server = smtplib.SMTP('smtp.gmail.com', 587)
        server.ehlo()
        # Encrypts the email
        context = ssl.create_default_context()
        server.starttls(context=context)
        # We log in into our Google account
        server.login(sender_email, password)
        # Sending email from sender, to receiver with the email body
        server.sendmail(sender_email, receiver_email, msg.as_string())
        print('Email sent!')
        if receiver_email in email_stats:
            email_stats[receiver_email] += 1
        else:
            email_stats[receiver_email] = 1
    except Exception as e:
        print(f'Oh no! Something bad happened!n {e}')

    finally:
        print('Closing the server...')
        server.quit()

print(email_stats) # output - all occurrences for each email 
with open(counter_file_path, "w") as f:
     json.dump(email_stats, f)