How to Send Mail Using Gmail in Python

What is SMTP:-

• SMTP stands for Simple Mail Transfer Protocol. SMTP is a set of communication guidelines that allow software to transmit an electronic mail over the internet is called Simple Mail Transfer Protocol. It is a program used for sending messages to other computer users based on e-mail addresses.

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
def MailSending():
    
    mail_content = '''Hello,This is Sample Mail which is Sent Using Python"
    '''
    #The mail addresses and password
    sender_address = "Sender's Email Address"
    sender_pass = 'password'
    receiver_address = 'receivers email address'
    #Setup the MIME
    message = MIMEMultipart()
    message['From'] = sender_address
    message['To'] = receiver_address
    message['Subject'] = 'A test mail sent by Python. '   #The subject line
    #The body and the attachments for the mail
    message.attach(MIMEText(mail_content, 'plain'))
    #Create SMTP session for sending the mail
    session = smtplib.SMTP('smtp.gmail.com', 587) #use gmail with port
    session.starttls() #enable security
    session.login(sender_address, sender_pass) #login with mail_id and password
    text = message.as_string()  
    session.sendmail(sender_address, receiver_address, text)
    session.quit()
    print('Mail Sent')
def main():
    print("Demonstration of Email Sending Using Gmail in Python ")
    MailSending()
if __name__=="__main__":
    main()

• The smtplib module is used to send mail to any internet machine with SMTP.

class smtplib.SMTP(host='', port=0, local_hostname=None, [timeout, ]source_address=None)

• Where we have to provide host and port as a parameter.
• We can provide remaining parameter as well but there is no complusion as these are keyword argument and if we don’t provide that it will take its default value.
• If the optional host and port parameters are given, the SMTP connect() method is called with those parameters during initialization.
• For normal use, you should only require the initialization/connect(), sendmail(), and SMTP.quit() methods. An example is included below.
• Connect():-

SMTP.connect(host='localhost', port=0)

• This Method connects the host on the given port.
• Sendmail():-

SMTP.sendmail(from_addr, to_addrs, msg, mail_options=(), rcpt_options=())

• To send an email SMTP.sendmail is used and from_address,to_address and msg these three are the mandatory fields.
• Quit():-

SMTP.quit()

• Terminate the SMTP session and close the connection. Return the result of the SMTP QUIT command.
• from email.mime.multipart we have to import MIMEMultipart

What is MIMEMultipart:-

• MIMEMultipart is for saying “I have more than one part”, and then listing the parts — you do that if you have attachments, you also do it to provide alternative versions of the same content.

class email.mime.multipart.MIMEMultipart(_subtype='mixed', boundary=None, _subparts=None, *, policy=compat32, **_params)

• All the parameters are default. You can specify if you want to specify it explicitly else there is no need.

class email.mime.text.MIMEText(_text, _subtype='plain', _charset=None, *, policy=compat32)

• The MIMEText class is used to create MIME objects of major type text.
• Only one parameter is needed rest all parameters are default.

SMTP.login(user, password, *, initial_response_ok=True)