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What is Python 3 smtplib sendmail?

The Simple Mail Transfer Protocol (SMTP) is a protocol that manages e-mail sending and routing between mail servers.

The smtplib module in Python creates an SMTP client session object that may be used to send emails to any Internet system that has an SMTP or ESMTP listening daemon.

Syntax of the python 3 smtplib sendmail

Here is a simple syntax for creating a single SMTP object that can then be used to send an email:

import smtplib
smtpObj = smtplib.SMTP( [host [, port [, local_hostname]]] )

Syntax parameters

These are the parameters:

• Host: This is the host that hosts the SMTP server. We can specify the host’s IP address or a domain name such as tutorialspoint.com. This is a non-mandatory argument.
• port: If we provide a host parameter, we must provide the port on which the SMTP server is listening. This port is normally 25.
• local_hostname: If the SMTP server is operating on the local system, we may use the option localhost only.

An SMTP object contains a sendmail instance method can do the job of mailing a message. It requires three parameters.

• The sender: A string containing the sender’s address.
• The receivers: A string list, one for each receiver.
• The message: A message as a string structured in accordance with the various RFCs.

Example

Here’s a basic Python script for sending one email:

#!/usr/bin/python3
import smtplib
sender = 'from@fromdomain.com'
receivers = ['to@todomain.com']
message = """From: From Person <from@fromdomain.com>
To: To Person <to@todomain.com>
Subject: SMTP e-mail test
This is a test e-mail message.
"""
try:
smtpObj = smtplib.SMTP('localhost')
smtpObj.sendmail(sender, receivers, message)
print "Successfully sent email"
except SMTPException:
print "Error: unable to send email"

In this case, we’ve included a simple e-mail in the message and formatted the headers appropriately with a triple quote.

We must include a From, To, and Subject header in an e-mail, separated from the content by a blank line.

To send the email, we use smtpObj to connect to the local SMTP server. Then, as arguments, use the sendmail method with the message, the from address, and the destination address.

Here, although if the from and to addresses are within the e-mail, they are not always to route the mail.

If we don’t have an SMTP server operating on our local system, we may use the smtplib client to interact with a distant SMTP server.

Unless we are using a webmail service (such as Gmail or Yahoo! Mail), the e-mail provider must have given us the outgoing mail server information, which we may offer as follows:

mail = smtplib.SMTP('smtp.gmail.com', 587)

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