How to send mails with attachment in python?

 smtplib: The smtplib module defines an SMTP client session object that can be used to send emails and files to any Internet machine with an SMTP or ESMTP listener daemon.

SMTP needs valid source and destination email ids, and port numbers. The port numbers vary for different sites. For example google, the port is 587.

SMTP(Simple Mail Transfer Protocol): 

SMTP is used to transfer mail from one user to another user. SMTP is a push protocol and is used to send the mail whereas POP(post office protocol) or IMAP(internet message access protocol) are used to retrieve those emails at the receiver's side.

MIME(Multipurpose Internet Mail Extension): 

We are using the MIME module to make it more flexible. Using the MIME header we can store the sender and receiver information and some other information. Another most important use of the MIME module is to set the attachment with mail.

Some important classes:

1. MIMEBase(_maintype, _subtype, *, policy=compat32, **_params): This is base class for all the MIME-specific subclasses of Message. 
2. MIMEMultipart(_subtype='mixed', boundary=None, _subparts=None, *, policy=compat32, **_params): This is intermidiate base class of MIME messgaes that are multipart.
3. MIMEAudio(_audiodata, _subtype=None, _encoder=email.encoders.encode_base64, *, policy=compat32, **_params): The MIMEAudio class is used to create MIME message object of major type audio. _audiodata is a string containing the raw audio data.
4. MIMEImage(_imagedata, _subtype=None, _encoder=email.encoders.encode_base64, *, policy=compat32, **_params): The MIMEImage class is used to create MIME message object of major type image. _imagedata is a strinfg containing the raw image data.

NOTE: If you are using Google's Gmail service to send mail. that time you need to do some settings for google security purposes. If those settings are not set up, then the following code may not work. Because Google doesn't support access from a third-party app.

How to allow access? 

You need to set 'Less Secure App Access' settings in your Google account. To off less secure app access, go to Google's Admin Console, and search for the Less Secure App setup.

Example: 

Example: 

# Send a mail with an attachment 
 
import smtplib 
from email.mime.multipart import MIMEMultipart 
from email.mime.text import MIMEText 
from email.mime.base import MIMEBase 
from email import encoders 
 
body = ''' 
Hello, Pratiksha 
I am attaching The invitation to a birthday celebration with this Email. 
Please come. 
 
Lot's of love, 
Tejaswi 
''' 
 
#Sender Email addresses and password 
senders_email = 'sender@gmail.com' 
sender_password = 'password' 
reveiver_email = 'receiver@gmail.com' 
 
#MIME Setup 
message = MIMEMultipart() 
message['From'] = senders_email 
message['To'] = reveiver_email 
message['Subject'] = 'Invitation Card' 
message.attach(MIMEText(body, 'plain')) 
 
## File 
attach_file_name = 'c2.text' 
attach_file = open(attach_file_name, 'rb')  
payload = MIMEBase('application', 'octate-stream') 
payload.set_payload((attach_file).read()) 
encoders.encode_base64(payload)  
payload.add_header('Content-Decomposition', 'attachment', filename=attach_file_name) 
message.attach(payload) 
 
#SMTP Connection For Sending Email 
session = smtplib.SMTP('smtp.gmail.com', 587) #use gmail with port 
session.starttls() #enable security 
session.login(senders_email, sender_password) #login with mail_id and password 
text = message.as_string() 
session.sendmail(senders_email, reveiver_email, text) 
session.quit() 
print('Mail sent sucessfully.') 

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