How to read emails from gmail?

Question

I am trying to connect my gmail to python, but show me this error:

I already checked my password, any idea what can be?

b'[AUTHENTICATIONFAILED] Invalid credentials (Failure)'
Traceback (most recent call last):
  File "/Users/myuser/Documents/migrations/untitled3.py", line 29, in read_email_from_gmail
    mail.login(FROM_EMAIL,FROM_PWD)
  File "/Users/myuser/opt/anaconda3/lib/python3.9/imaplib.py", line 612, in login
    raise self.error(dat[-1])
imaplib.IMAP4.error: b'[AUTHENTICATIONFAILED] Invalid credentials (Failure)'

Here my code: Also i want to know which port I can use?

import smtplib
import time
import imaplib
import email
import traceback 

ORG_EMAIL = "@gmail.com" 
FROM_EMAIL = "myemail" + ORG_EMAIL 
FROM_PWD = "mypassword" 
SMTP_SERVER = "smtp.gmail.com" 
SMTP_PORT = ??

def read_email_from_gmail():
    try:
        mail = imaplib.IMAP4_SSL(SMTP_SERVER)
        mail.login(FROM_EMAIL,FROM_PWD)
        mail.select('inbox')

        data = mail.search(None, 'ALL')
        mail_ids = data[1]
        id_list = mail_ids[0].split()   
        first_email_id = int(id_list[0])
        latest_email_id = int(id_list[-1])

        for i in range(latest_email_id,first_email_id, -1):
            data = mail.fetch(str(i), '(RFC822)' )
            for response_part in data:
                arr = response_part[0]
                if isinstance(arr, tuple):
                    msg = email.message_from_string(str(arr[1],'utf-8'))
                    email_subject = msg['subject']
                    email_from = msg['from']
                    print('From : ' + email_from + '\n')
                    print('Subject : ' + email_subject + '\n')

    except Exception as e:
        traceback.print_exc() 
        print(str(e))

read_email_from_gmail()

My main goal is be able to get the CSV file from each email, but for now I just want to read messages.

Answer 1

Best way to read email is using GMAIL API. Google has stopped accessing gmail account using username and password via any outside app from 30 the May 2022. So this is how you read gmail from python.

What this app does:

• Read gmail message (Unread)
• Make the message as Read after reading the message

import os.path
import base64
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build

SCOPES = ['https://www.googleapis.com/auth/gmail.readonly','https://www.googleapis.com/auth/gmail.modify']

def readEmails():
    """Shows basic usage of the Gmail API.
    Lists the user's Gmail labels.
    """
    creds = None
    # The file token.json stores the user's access and refresh tokens, and is
    # created automatically when the authorization flow completes for the first
    # time.
    if os.path.exists('token.json'):
        creds = Credentials.from_authorized_user_file('token.json', SCOPES)
    # If there are no (valid) credentials available, let the user log in.
    if not creds or not creds.valid:
        if creds and creds.expired and creds.refresh_token:
            creds.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file(               
                # your creds file here. Please create json file as here https://cloud.google.com/docs/authentication/getting-started
                'my_cred_file.json', SCOPES)
            creds = flow.run_local_server(port=0)
        # Save the credentials for the next run
        with open('token.json', 'w') as token:
            token.write(creds.to_json())
    try:
        # Call the Gmail API
        service = build('gmail', 'v1', credentials=creds)
        results = service.users().messages().list(userId='me', labelIds=['INBOX'], q="is:unread").execute()
        messages = results.get('messages',[]);
        if not messages:
            print('No new messages.')
        else:
            message_count = 0
            for message in messages:
                msg = service.users().messages().get(userId='me', id=message['id']).execute()                
                email_data = msg['payload']['headers']
                for values in email_data:
                    name = values['name']
                    if name == 'From':
                        from_name= values['value']                
                        for part in msg['payload']['parts']:
                            try:
                                data = part['body']["data"]
                                byte_code = base64.urlsafe_b64decode(data)

                                text = byte_code.decode("utf-8")
                                print ("This is the message: "+ str(text))

                                # mark the message as read (optional)
                                msg  = service.users().messages().modify(userId='me', id=message['id'], body={'removeLabelIds': ['UNREAD']}).execute()                                                       
                            except BaseException as error:
                                pass                            
    except Exception as error:
        print(f'An error occurred: {error}')

You need to create credential file in Google account How to create credential file here https://cloud.google.com/docs/authentication/getting-started

Answer 2

Here's the problem, Gmail has a new politic who doesn't allow to use insecure apps.

To help keep your account secure, from May 30, 2022, ​​Google no longer supports the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password.