Develop Reference

Show first and last name in header when using Gmail API (python)

I have my mail my_name#company.com and uses gmails API (and python) to send some mails. The problem is that when the mail hit the inbox the "from" is shown as my_name#company.com '<my_name#company.com>' where I want it to be First Name <my_name#company.com>.
I have tried using different variations of "First Name '<my_name#company.com>'" but I get a RefreshError: ('invalid_request: Invalid impersonation "sub" field.', '{\n "error": "invalid_request",\n "error_description": "Invalid impersonation \\u0026quot;sub\\u0026quot; field."\n}').
from __future__ import print_function
from googleapiclient.discovery import build
from apiclient import errors
from httplib2 import Http
from email.mime.text import MIMEText
import base64
from google.oauth2 import service_account
# Email variables. Modify this!
EMAIL_FROM = "First Last '<my_name#company.com>'"
EMAIL_TO = 'some_mail#hotmail.com'
EMAIL_SUBJECT = 'Hello from Me!'
EMAIL_CONTENT = 'Some body'
# Call the Gmail API
def service_account_login():
SCOPES = ['https://www.googleapis.com/auth/gmail.send']
SERVICE_ACCOUNT_FILE = 'my-credentials.json'
credentials = service_account.Credentials.from_service_account_file(
SERVICE_ACCOUNT_FILE, scopes=SCOPES)
delegated_credentials = credentials.with_subject(EMAIL_FROM)
service = build('gmail', 'v1', credentials=delegated_credentials)
return service
def create_message(sender, to, subject, message_text):
message = MIMEText(message_text)
message['to'] = to
message['from'] = sender
message['subject'] = subject
raw = base64.urlsafe_b64encode(message.as_bytes())
raw = raw.decode()
return {"raw": raw}
def send_message(service, user_id, message):
try:
message = (service.users().messages().send(userId=user_id, body=message)
.execute())
print('Message Id: %s' % message['id'])
return message
except errors.HttpError as error:
print('An error occurred: %s' % error)
service = service_account_login()
message = create_message(EMAIL_FROM, EMAIL_TO, EMAIL_SUBJECT, EMAIL_CONTENT)
sent = send_message(service,'me', message)

I just sent an email recently showing the name as you wanted, I got it with this line, similar to what you already had but without the single quotation marks:
message['from'] = "First Name <something#example.com>"

So the trick is fairly simple - the EMAIL_FROM is first used to create a service with that email, which is why you cannot write My Name <my_name#company.com>. You can do that when you need to specify the "FROM " mail e.g in the very buttom of create_message= f"First name<{EMAIL_FROM}>,...)

Gmail API Python: Optimize code to send email faster

The code below works. I can send emails through the Gmail API, but it takes awhile to send 10 personalized emails, based on wall time (20-30 secs). Is there a way to optimize the code below to send emails faster? There are quota limitations.
Is the max number emails one can send, a 100 per day? There seems to be a difference between number of emails one can send and the number of receipts per email. This is the documentation I am sourcing: https://developers.google.com/apps-script/guides/services/quotas
I am using the consumer version.
Feature Consumer (gmail.com)
Calendar events created 5,000
Contacts created 1,000
Documents created 250
Email recipients per day 100*
Code:
import httplib2
import os
import oauth2client
from oauth2client import client, tools
import base64
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from apiclient import errors, discovery
import mimetypes
import pandas as pd
import textwrap
SCOPES = 'https://www.googleapis.com/auth/gmail.send'
CLIENT_SECRET_FILE = 'secret.json'
APPLICATION_NAME = 'AppName'
def get_credentials():
home_dir = os.path.expanduser('~')
credential_dir = os.path.join(home_dir, '.credentials')
if not os.path.exists(credential_dir):
os.makedirs(credential_dir)
credential_path = os.path.join(credential_dir,
'gmail-send.json')
store = oauth2client.file.Storage(credential_path)
credentials = store.get()
if not credentials or credentials.invalid:
flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
flow.user_agent = APPLICATION_NAME
credentials = tools.run_flow(flow, store)
print 'Storing credentials to ' + credential_path
return credentials
def SendMessage(sender, to, subject,message_text):
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
message1 = CreateMessageHtml(sender, to, subject, message_text)
result = SendMessageInternal(service, "me", message1)
return result
def CreateMessageHtml(sender, to, subject, message_text):
msg = MIMEText(message_text)
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = to
return {'raw': base64.urlsafe_b64encode(msg.as_string())}
def SendMessageInternal(service, user_id, message):
try:
message = (service.users().messages().send(userId=user_id, body=message).execute())
print 'Message Id: %s' % message['id']
return message
except errors.HttpError, error:
print 'An error occurred: %s' % error
return "Error"
return "OK"
def main():
df = pd.read_csv('testdata.csv')
for index,row in df.iterrows():
to = row['Email']
sender = "sender"
subject = "subject"
dedent_text = '''Hello {}, \n
thank you for your question.'''.format(row['First'])
message_text = textwrap.dedent(dedent_text).strip()
SendMessage(sender, to, subject, message_text)
if __name__ == '__main__':
main()

Try caching the result of the service call, so that service is passed to SendMessage. This way, you don't take API call times to setup the API for each individual emails you send.
So at top of your main:
def main():
# Do once
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
df = pd.read_csv('testdata.csv')
for index,row in df.iterrows():
to = row['Email']
sender = "sender"
subject = "subject"
dedent_text = '''Hello {}, \n
thank you for your question.'''.format(row['First'])
message_text = textwrap.dedent(dedent_text).strip()
# service is is reused here for each message
SendMessage(service, sender, to, subject, message_text)
Also, if you need to send many messages, make sure you invoke one Python invokation per large batch, since starting up the interpreter and loading many packages can take a while each time.

Sending an email using the gmail api

I am writing a simple script to send an email using the google api:
My code looks like:
import httplib2
import os
import oauth2client
from oauth2client import client, tools
import base64
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from apiclient import errors, discovery
import mimetypes
from email.mime.image import MIMEImage
from email.mime.audio import MIMEAudio
from email.mime.base import MIMEBase
SCOPES = 'https://www.googleapis.com/auth/gmail.send'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Gmail API Python Send Email'
def get_credentials():
home_dir = os.path.expanduser('~')
credential_dir = os.path.join(home_dir, '.credentials')
if not os.path.exists(credential_dir):
os.makedirs(credential_dir)
credential_path = os.path.join(credential_dir,
'gmail-python-email-send.json')
store = oauth2client.file.Storage(credential_path)
credentials = store.get()
if not credentials or credentials.invalid:
flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
flow.user_agent = APPLICATION_NAME
credentials = tools.run_flow(flow, store)
print ('Storing credentials to ' + credential_path)
return credentials
def SendMessage(sender, to, subject, msgHtml, msgPlain, attachmentFile=None):
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
if attachmentFile:
message1 = createMessageWithAttachment(sender, to, subject, msgHtml, msgPlain, attachmentFile)
else:
message1 = CreateMessageHtml(sender, to, subject, msgHtml, msgPlain)
result = SendMessageInternal(service, "me", message1)
return result
def SendMessageInternal(service, user_id, message):
try:
message = (service.users().messages().send(userId=user_id, body=message).execute())
print ('Message Id: %s' % message['id'])
return message
except errors.HttpError as error:
print ('An error occurred: %s' % error)
return "Error"
return "OK"
def CreateMessageHtml(sender, to, subject, msgHtml, msgPlain):
msg = MIMEMultipart('alternative')
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = to
msg.attach(MIMEText(msgPlain, 'plain'))
msg.attach(MIMEText(msgHtml, 'html'))
return {'raw': base64.urlsafe_b64encode(msg.as_string())}
def main():
to = "user#gmail.com"
sender = "user#gmail.com"
subject = "testing"
msgHtml = "Hi<br/>Html Email"
msgPlain = "Hi\nPlain Email"
SendMessage(sender, to, subject, msgHtml, msgPlain)
if __name__ == '__main__':
main()
However, when I run this script, I get the error that:
I went to go ensure the files existed, and navigated to the path. The directory contained these files:
so clearly the clientsecrets.py file does exist. I am unsure of how to resolve this error, as the file is clearly there and the terminal does map the file correctly. Any suggestions would be appreciated. Thank you!

In your error message We can see No such file or directory: 'client_secret.json'. Do you have it then store it in your current directory If you don't have it, you can see how to retrieve client_secret.json using Python Quickstart
Don't forget to turn on your gmail API

Error 400 when sending a message using python

I am trying to send an email using Gmail API. I have successfully authenticated and have a client_secret.json file on my machine.
I have been able to get a list of labels using the quickstart example on the Gmail API website
I have reset my scope successfully to
SCOPES = 'https://mail.google.com'
allowing full access to my gmail account.
I have a python script, compiled from here and here. See below. When executing the script I get the following error message:
An error occurred: https://www.googleapis.com/gmail/v1/users/me/messages/send?alt=json returned "'raw' RFC822 payload message string or uploading message via /upload/* URL required">
Any thoughts on what I am doing wrong and how to fix it?
from __future__ import print_function
import argparse
import time
from time import strftime, localtime
import os
import base64
import os
import httplib2
from httplib2 import Http
from apiclient import errors
from apiclient import discovery
import oauth2client
from oauth2client import file, client, tools
SCOPES = 'https://mail.google.com'
CLIENT_SECRET_FILE = 'client_secret.json'
store = file.Storage('storage.json')
credentials = store.get()
if not credentials or credentials.invalid:
flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
flow = client.flow_from_clientsecrets('client_secret.json', SCOPES)
credentials = tools.run_flow(flow, store, flags)
def get_credentials():
"""Gets valid user credentials from storage.
If nothing has been stored, or if the stored credentials are invalid,
the OAuth2 flow is completed to obtain the new credentials.
Returns:
Credentials, the obtained credential.
"""
home_dir = os.path.expanduser('~')
credential_dir = os.path.join(home_dir, '.credentials')
if not os.path.exists(credential_dir):
os.makedirs(credential_dir)
credential_path = os.path.join(credential_dir,
'gmail-python-quickstart.json')
store = oauth2client.file.Storage(credential_path)
credentials = store.get()
if not credentials or credentials.invalid:
flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
flow.user_agent = APPLICATION_NAME
if flags:
credentials = tools.run_flow(flow, store, flags)
else: # Needed only for compatibility with Python 2.6
credentials = tools.run(flow, store)
print('Storing credentials to ' + credential_path)
return credentials
def send_message(service, user_id, message):
"""Send an email message.
Args:
service: Authorized Gmail API service instance.
user_id: User's email address. The special value "me"
can be used to indicate the authenticated user.
message: Message to be sent.
Returns:
Sent Message.
"""
try:
message = (service.users().messages().send(userId=user_id, body=message)
.execute())
print ('Message Id: %s' % message['id'])
return message
except errors.HttpError, error:
print ('An error occurred: %s' % error)
def main():
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
send_message(service, 'me','test message')
main()

A message has to be created like it is outlined in the Sending Email guide:
def create_message(sender, to, subject, message_text):
message = MIMEText(message_text)
message['to'] = to
message['from'] = sender
message['subject'] = subject
return {'raw': base64.urlsafe_b64encode(message.as_string())}
def main():
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
message = create_message(
'sender#gmail.com', 'receiver#gmail.com', 'Subject', 'Message text'
)
send_message(service, 'me', message)

How to send an email through gmail without enabling 'insecure access'?

Google are pushing us to improve the security of script access to their gmail smtp servers. I have no problem with that. In fact I'm happy to help.
But they're not making it easy. It's all well and good to suggest we Upgrade to a more secure app that uses the most up to date security measures, but that doesn't help me work out how to upgrade bits of code that look like this:
server = smtplib.SMTP("smtp.gmail.com", 587)
server.ehlo()
server.starttls()
server.login(GMAIL_USER, GMAIL_PASSWORD)
server.sendmail(FROM, TO, MESSAGE)
server.close()
Sure, I'll go and turn on "Access for less secure apps", but if anyone has worked out what to replace this code with, I'll be grateful.

This was painful, but I seem to have something going now...
Python3 is not supported (yet)
I don't think it will be too hard to attain, as I was stumbling through converting packages without hitting anything massive: just the usual 2to3 stuff. Yet after a couple of hours I got tired of swimming upstream. At time of writing, I couldn't find a published package for public consumption for Python 3. The python 2 experience was straight-forward (in comparison).
Navigating the Google website is half the battle
No doubt, over time, this will change. Ultimately you need to download a client_secret.json file. You can only (probably) do this setting up stuff via a web browser:
You need a google account - either google apps or gmail. So, if you haven't got one, go get one.
Get yourself to the developers console
Create a new project, and wait 4 or 400 seconds for that to complete.
Navigate to API's and Auth -> Credentials
Under OAuth select Create New Client ID
Choose Installed Application as the application type and Other
You should now have a button Download JSON. Do that. It's your client_secret.json—the passwords so to speak
But wait that's not all!
You have to give your application a "Product Name" to avoid some odd errors. (see how much I suffered to give you this ;-)
Navigate to API's & auth -> Consent Screen
Choose your email
Enter a PRODUCT NAME. It doesn't matter what it is. "Foobar" will do fine.
Save
Newsflash! Whoa. Now there's even more!
Navigate to API's & auth -> APIs -> Gmail API
Click the button Enable API
Yay. Now we can update the emailing script.
Python 2
You need to run the script interactively the first time. It will open a web browser on your machine and you'll grant permissions (hit a button). This exercise will save a file to your computer gmail.storage which contains a reusable token.
[I had no luck transferring the token to a machine which has no graphical browser functionality—returns an HTTPError. I tried to get through it via the lynx graphical browser. That also failed because google have set the final "accept" button to "disabled"!? I'll raise another question to jump this hurdle (more grumbling)]
First you need some libraries:
pip install --upgrade google-api-python-client
pip install --upgrade python-gflags
you need to change the to and from addresses
make sure you have the client_token.json file whereever the Storage instructions expect it
the directory needs to be writable so it can save the gmail.storage file
Finally some code:
import base64
import httplib2
from email.mime.text import MIMEText
from apiclient.discovery import build
from oauth2client.client import flow_from_clientsecrets
from oauth2client.file import Storage
from oauth2client.tools import run
# Path to the client_secret.json file downloaded from the Developer Console
CLIENT_SECRET_FILE = 'client_secret.json'
# Check https://developers.google.com/gmail/api/auth/scopes for all available scopes
OAUTH_SCOPE = 'https://www.googleapis.com/auth/gmail.compose'
# Location of the credentials storage file
STORAGE = Storage('gmail.storage')
# Start the OAuth flow to retrieve credentials
flow = flow_from_clientsecrets(CLIENT_SECRET_FILE, scope=OAUTH_SCOPE)
http = httplib2.Http()
# Try to retrieve credentials from storage or run the flow to generate them
credentials = STORAGE.get()
if credentials is None or credentials.invalid:
credentials = run(flow, STORAGE, http=http)
# Authorize the httplib2.Http object with our credentials
http = credentials.authorize(http)
# Build the Gmail service from discovery
gmail_service = build('gmail', 'v1', http=http)
# create a message to send
message = MIMEText("Message goes here.")
message['to'] = "yourvictim#goes.here"
message['from'] = "you#go.here"
message['subject'] = "your subject goes here"
body = {'raw': base64.b64encode(message.as_string())}
# send it
try:
message = (gmail_service.users().messages().send(userId="me", body=body).execute())
print('Message Id: %s' % message['id'])
print(message)
except Exception as error:
print('An error occurred: %s' % error)
Hopefully that gets us all started. Not as simple as the old way, but does look a lot less complicated now I can see it in the flesh.

It seems that John Mee's answer is out of date.
It does not work in July, 2016.
Maybe due to the update of Gmail's API.
I update his code (python 2) as below:
"""Send an email message from the user's account.
"""
import base64
from email.mime.audio import MIMEAudio
from email.mime.base import MIMEBase
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
import mimetypes
import os
#from __future__ import print_function
import httplib2
import os
from apiclient import discovery
import oauth2client
from oauth2client import client
from oauth2client import tools
from apiclient import errors
SCOPES = 'https://www.googleapis.com/auth/gmail.compose'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Gmail API Python Quickstart'
try:
import argparse
flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
flags = None
def SendMessage(service, user_id, message):
"""Send an email message.
Args:
service: Authorized Gmail API service instance.
user_id: User's email address. The special value "me"
can be used to indicate the authenticated user.
message: Message to be sent.
Returns:
Sent Message.
"""
try:
message = (service.users().messages().send(userId=user_id, body=message)
.execute())
print 'Message Id: %s' % message['id']
return message
except errors.HttpError, error:
print 'An error occurred: %s' % error
def CreateMessage(sender, to, subject, message_text):
"""Create a message for an email.
Args:
sender: Email address of the sender.
to: Email address of the receiver.
subject: The subject of the email message.
message_text: The text of the email message.
Returns:
An object containing a base64url encoded email object.
"""
message = MIMEText(message_text)
message['to'] = to
message['from'] = sender
message['subject'] = subject
return {'raw': base64.urlsafe_b64encode(message.as_string())}
def get_credentials():
"""Gets valid user credentials from storage.
If nothing has been stored, or if the stored credentials are invalid,
the OAuth2 flow is completed to obtain the new credentials.
Returns:
Credentials, the obtained credential.
"""
home_dir = os.path.expanduser('~')
credential_dir = os.path.join(home_dir, '.credentials')
if not os.path.exists(credential_dir):
os.makedirs(credential_dir)
credential_path = os.path.join(credential_dir,
'sendEmail.json')
store = oauth2client.file.Storage(credential_path)
credentials = store.get()
if not credentials or credentials.invalid:
flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
flow.user_agent = APPLICATION_NAME
if flags:
credentials = tools.run_flow(flow, store, flags)
else: # Needed only for compatibility with Python 2.6
credentials = tools.run(flow, store)
print('Storing credentials to ' + credential_path)
return credentials
if __name__ == "__main__":
try:
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
SendMessage(service, "me", CreateMessage("send#gmail.com", "receive#gmail.com", "Test gmail automation", "Hello world"))
except Exception, e:
print e
raise
Note that if you encounter the error Insufficient Permission, one possible reason is that the scope in program is not set correctly.
The other possible reason may be that you need to delete the storage json file ("sendEmail.json" in this program) and refresh your program. More details may be seen in this post.

Updated sample for Python 3, and GMail's current API, below.
Note that to get the credentials.json file below, you'll need to create an Oauth client ID credential here, after selecting the relevant GCP project. Once you've created it you'll be shown the client key and client secret. Close that prompt, and click the down arrow next to the account. This is the file you'll need.
import base64
import logging
import mimetypes
import os
import os.path
import pickle
from email.mime.text import MIMEText
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
from googleapiclient import errors
from googleapiclient.discovery import build
def get_service():
"""Gets an authorized Gmail API service instance.
Returns:
An authorized Gmail API service instance..
"""
# If modifying these scopes, delete the file token.pickle.
SCOPES = [
'https://www.googleapis.com/auth/gmail.readonly',
'https://www.googleapis.com/auth/gmail.send',
]
creds = None
# The file token.pickle 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.pickle'):
with open('token.pickle', 'rb') as token:
creds = pickle.load(token)
# 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(
'credentials.json', SCOPES)
creds = flow.run_local_server(port=0)
# Save the credentials for the next run
with open('token.pickle', 'wb') as token:
pickle.dump(creds, token)
service = build('gmail', 'v1', credentials=creds)
return service
def send_message(service, sender, message):
"""Send an email message.
Args:
service: Authorized Gmail API service instance.
user_id: User's email address. The special value "me"
can be used to indicate the authenticated user.
message: Message to be sent.
Returns:
Sent Message.
"""
try:
sent_message = (service.users().messages().send(userId=sender, body=message)
.execute())
logging.info('Message Id: %s', sent_message['id'])
return sent_message
except errors.HttpError as error:
logging.error('An HTTP error occurred: %s', error)
def create_message(sender, to, subject, message_text):
"""Create a message for an email.
Args:
sender: Email address of the sender.
to: Email address of the receiver.
subject: The subject of the email message.
message_text: The text of the email message.
Returns:
An object containing a base64url encoded email object.
"""
message = MIMEText(message_text)
message['to'] = to
message['from'] = sender
message['subject'] = subject
s = message.as_string()
b = base64.urlsafe_b64encode(s.encode('utf-8'))
return {'raw': b.decode('utf-8')}
if __name__ == '__main__':
logging.basicConfig(
format="[%(levelname)s] %(message)s",
level=logging.INFO
)
try:
service = get_service()
message = create_message("from#gmail.com", "to#gmail.com", "Test subject", "Test body")
send_message(service, "from#gmail.com", message)
except Exception as e:
logging.error(e)
raise

Have you considered using the Gmail API? The API has security features built in and is optimized specifically for Gmail. You can find the API documentation on http://developers.google.com - for example, here's the documentation for the Send API call:
https://developers.google.com/gmail/api/v1/reference/users/messages/send

I'm including some code that has been updated for python 3 usage - it seems to send emails once you get the necessary permissions and OAuth tokens working. It's mostly based off the Google API website samples.
from __future__ import print_function
import base64
import os
from email.mime.text import MIMEText
import httplib2
from apiclient import discovery
from googleapiclient import errors
from oauth2client import client
from oauth2client import tools
from oauth2client.file import Storage
try:
import argparse
flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
flags = None
# If modifying these scopes, delete your previously saved credentials
# at ~/.credentials/gmail-python-quickstart.json
SCOPES = 'https://www.googleapis.com/auth/gmail.send'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Gmail API Python Quickstart'
def get_credentials():
"""Gets valid user credentials from storage.
If nothing has been stored, or if the stored credentials are invalid,
the OAuth2 flow is completed to obtain the new credentials.
Returns:
Credentials, the obtained credential.
"""
home_dir = os.path.expanduser('~')
credential_dir = os.path.join(home_dir, '.credentials')
if not os.path.exists(credential_dir):
os.makedirs(credential_dir)
credential_path = os.path.join(credential_dir,
'gmail-python-quickstart.json')
store = Storage(credential_path)
credentials = store.get()
if not credentials or credentials.invalid:
flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
flow.user_agent = APPLICATION_NAME
if flags:
credentials = tools.run_flow(flow, store, flags)
else: # Needed only for compatibility with Python 2.6
credentials = tools.run(flow, store)
print('Storing credentials to ' + credential_path)
return credentials
to = 'test#email.com'
sender = 'test#email.com'
subject = 'test emails'
message_text = 'hello this is a text test message'
user_id = 'me'
def create_message(sender, to, subject, message_text):
"""Create a message for an email.
Args:
sender: Email address of the sender.
to: Email address of the receiver.
subject: The subject of the email message.
message_text: The text of the email message.
Returns:
An object containing a base64url encoded email object.
"""
message = MIMEText(message_text)
message['to'] = to
message['from'] = sender
message['subject'] = subject
return {'raw': (base64.urlsafe_b64encode(message.as_bytes()).decode())}
def send_message(service, user_id, message):
"""Send an email message.
Args:
service: Authorized Gmail API service instance.
user_id: User's email address. The special value "me"
can be used to indicate the authenticated user.
message: Message to be sent.
Returns:
Sent Message.
"""
try:
message = (service.users().messages().send(userId=user_id, body=message)
.execute())
print('Message Id: {}'.format(message['id']))
return message
except errors.HttpError as error:
print('An error occurred: {}'.format(error))
def main():
"""Shows basic usage of the Gmail API.
Creates a Gmail API service object and outputs a list of label names
of the user's Gmail account.
"""
credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('gmail', 'v1', http=http)
msg = create_message(sender,to,subject,message_text)
message = (service.users().messages().send(userId=user_id, body=msg)
.execute())
print('Message Id: {}'.format(message['id']))
results = service.users().messages().list(userId='me').execute()
labels = results.get('labels', [])
if not labels:
print('No labels found.')
else:
print('Labels:')
for label in labels:
print(label['name'])
if __name__ == '__main__':
main()

it is very simple.
Go to Gmail account settings.
Search for "App passwords".
Generate an app password.
Use that password instead of the Gmail password.
The advantage of app password is that you don't need to turn off two factor authentication and also you don't need to allow insecure apps.
This is the official link about Google app passwords https://support.google.com/mail/answer/185833?hl=en-GB
Hope this helps👍

protected string SendEmail(string toAddress, string subject, string body)
{
string result = "Message Sent Successfully..!!";
string senderID = "...........";// use sender's email id here..
const string senderPassword = "........."; // sender password here...
try
{
SmtpClient smtp = new SmtpClient
{
Host = "smtp.gmail.com", // smtp server address here...
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
Credentials = new System.Net.NetworkCredential(senderID, senderPassword),
Timeout = 30000,
};
MailMessage message = new MailMessage(senderID, toAddress, subject, body);
smtp.Send(message);
}
catch (Exception ex)
{
result = "Error sending email.!!!";
}
return result;
}