[Python] Send gmail with python: Send one by one with multiple image files attached


It is a summary when I was investigating because I wanted to send gmail with python. Just a memo.

Roughly the same as the reference below,

The photos in a specific directory are repeatedly read and sent.

Reference: https://qiita.com/numaC/items/076474934a3bb45647bd

Thank you for the reference site.



The conclusion is as follows. However, I think that in most cases you will get an "SMTPAuthenticationError". Please refer to it from the "Contents" section below.


import os
import glob
from smtplib import SMTP
from email.mime.text import MIMEText
from email import encoders
from email.mime.base import MIMEBase
from email.mime.multipart import MIMEMultipart

def sendGmailAttach():
    sender, password = "[email protected]", "testtest" #Sender email address and login information to gmail
    to = '[email protected]'  #Destination email address
    sub = 'Sending test email' #Email subject
    body = 'The image is attached.'  #the content of the email
    host, port = 'smtp.gmail.com', 587

    #Email header
    msg = MIMEMultipart()
    msg['Subject'] = sub
    msg['From'] = sender
    msg['To'] = to

    #the content of the email
    body = MIMEText(body)

    #Additional part
    fetch_from_dir = glob.glob(os.getcwd() + "\img/*")
    fetch_from_dir_len = len(fetch_from_dir)
    len_cnt = 0
    for target_list in fetch_from_dir:

        #Attachment settings
        attach_file = {
            'name': os.path.basename(target_list),
            'path': target_list
        } #name is the attached file name. path specifies the location of the attachment
        attachment = MIMEBase('image', 'png')
        file = open(attach_file['path'], 'rb+')
        attachment.add_header("Content-Disposition", "attachment", filename=attach_file['name'])

        #Connect to gmail(Used as an SMTP server)
        gmail=SMTP("smtp.gmail.com", 587)
        gmail.starttls() #Encrypt SMTP communication commands and authenticate server access
        gmail.login(sender, password)
        len_cnt += 1
        print('Mail' + str(len_cnt) + '/' + str(fetch_from_dir_len) + 'Sent')

if __name__ == '__main__':
    print('All emails have been sent')

Execution result

$ python sendmail.py
Email is 1/3 sent
Email 2/3 sent
Email 3/3 sent
All emails have been sent


About error at the time of transmission

You will probably get the following error when you run the program:

smtplib.SMTPAuthenticationError: (535, ‘5.7.8 Username and Password not accepted. Learn more at\n5.7.8 https://support.google.com/mail/?p=BadCredentials

This is resolved on the gmail side as "use app password".

The following is a reference site. Thank you very much.

Reference: https://www.gocca.work/python-mailerror/

I will write a rough procedure, but for details, see the reference site.

-Step 1: After logging in to your google account
-Step 2: Set up "2-step authentication process"
-Step 3: Generate "App Password"

About the program

I made a note as a method for the time being, so error handling etc. are not enough, so please take appropriate measures.

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