Send email in Python conveniently for gmail using yagmail

Overview

yagmail -- Yet Another GMAIL/SMTP client

Join the chat at https://gitter.im/kootenpv/yagmail PyPI PyPI

For the asynchronous asyncio version, look here: https://github.com/kootenpv/aioyagmail

The goal here is to make it as simple and painless as possible to send emails.

In the end, your code will look something like this:

import yagmail
yag = yagmail.SMTP()
contents = ['This is the body, and here is just text http://somedomain/image.png',
            'You can find an audio file attached.', '/local/path/song.mp3']
yag.send('[email protected]', 'subject', contents)

Or a simple one-liner:

yagmail.SMTP('mygmailusername').send('[email protected]', 'subject', 'This is the body')

Note that it will read the password securely from your keyring (read below). If you don't want this, you can also initialize with:

yag = yagmail.SMTP('mygmailusername', 'mygmailpassword')

In 2020, I personally prefer: using an Application-Specific Password

Table of Contents

Section Explanation
Install Find the instructions on how to install yagmail here
Username and password No more need to fill in username and password in scripts
Start a connection Get started
Usability Shows some usage patterns for sending
Recipients How to send to multiple people, give an alias or send to self
Magical contents Really easy to send text, html, images and attachments
Feedback How to send me feedback
Roadmap (and priorities) Yup
Errors List of common errors for people dealing with sending emails

Install

For Python 2.x and Python 3.x respectively:

pip install yagmail[all]
pip3 install yagmail[all]

If you get problems installing keyring, try installing without, i.e. pip install yagmail.

As a side note, yagmail can now also be used to send emails from the command line.

Username and password

keyring quoted:

The Python keyring lib provides a easy way to access the system keyring service from python. It can be used in any application that needs safe password storage.

You know you want it. Set it up by opening a Python interpreter and running:

import yagmail
yagmail.register('mygmailusername', 'mygmailpassword')

In fact, it is just a wrapper for keyring.set_password('yagmail', 'mygmailusername', 'mygmailpassword').

When no password is given and the user is not found in the keyring, getpass.getpass() is used to prompt the user for a password. Upon entering this once, it can be stored in the keyring and never asked again.

Another convenience can be to save a .yagmail file in your home folder, containing just the email username. You can then omit everything, and simply use yagmail.SMTP() to connect. Of course, this wouldn't work with more accounts, but it might be a nice default. Upon request I'll consider adding more details to this .yagmail file (host, port and other settings).

Start a connection

yag = yagmail.SMTP('mygmailusername')

Note that this connection is reusable, closable and when it leaves scope it will clean up after itself in CPython.

As tilgovi points out in #39, SMTP does not automatically close in PyPy. The context manager with should be used in that case.

Usability

Defining some variables:

to = '[email protected]'
to2 = '[email protected]'
to3 = '[email protected]'
subject = 'This is obviously the subject'
body = 'This is obviously the body'
html = '<a href="https://pypi.python.org/pypi/sky/">Click me!</a>'
img = '/local/file/bunny.png'

All variables are optional, and know that not even to is required (you'll send an email to yourself):

yag.send(to = to, subject = subject, contents = body)
yag.send(to = to, subject = subject, contents = [body, html, img])
yag.send(contents = [body, img])

Furthermore, if you do not want to be explicit, you can do the following:

yag.send(to, subject, [body, img])

Recipients

It is also possible to send to a group of people by providing a list of email strings rather than a single string:

yag.send(to = to)
yag.send(to = [to, to2]) # List or tuples for emailadresses *without* aliases
yag.send(to = {to : 'Alias1'}) # Dictionary for emailaddress *with* aliases
yag.send(to = {to : 'Alias1', to2 : 'Alias2'}

Giving no to argument will send an email to yourself. In that sense, yagmail.SMTP().send() can already send an email. Be aware that if no explicit to = ... is used, the first argument will be used to send to. Can be avoided like:

yag.send(subject = 'to self', contents = 'hi!')

Note that by default all email addresses are conservatively validated using soft_email_validation==True (default).

Oauth2

It is even safer to use Oauth2 for authentication, as you can revoke the rights of tokens.

This is one of the best sources, upon which the oauth2 code is heavily based.

The code:

yag = SMTP("[email protected]", oauth2_file="~/oauth2_creds.json")
yag.send(subject="Great!")

It will prompt for a google_client_id and a google_client_secret, when the file cannot be found. These variables can be obtained following the previous link.

After you provide them, a link will be shown in the terminal that you should followed to obtain a google_refresh_token. Paste this again, and you're set up!

Note that people who obtain the file can send emails, but nothing else. As soon as you notice, you can simply disable the token.

Magical contents

The contents argument will be smartly guessed. It can be passed a string (which will be turned into a list); or a list. For each object in the list:

  • If it is a dictionary it will assume the key is the content and the value is an alias (only for images currently!) e.g. {'/path/to/image.png' : 'MyPicture'}
  • It will try to see if the content (string) can be read as a file locally, e.g. '/path/to/image.png'
  • if impossible, it will check if the string is valid html e.g. <h1>This is a big title</h1>
  • if not, it must be text. e.g. 'Hi Dorika!'

Note that local files can be html (inline); everything else will be attached.

Local files require to have an extension for their content type to be inferred.

As of version 0.4.94, raw and inline have been added.

  • raw ensures a string will not receive any "magic" (inlining, html, attaching)
  • inline will make an image appear in the text.

Feedback

I'll try to respond to issues within 24 hours at Github.....

And please send me a line of feedback with SMTP().feedback('Great job!') :-)

Roadmap (and priorities)

  • Added possibility of Image
  • Optional SMTP arguments should go with **kwargs to my SMTP
  • CC/BCC (high)
  • Custom names (high)
  • Allow send to return a preview rather than to actually send
  • Just use attachments in "contents", being smart guessed (high, complex)
  • Attachments (contents) in a list so they actually define the order (medium)
  • Use lxml to see if it can parse the html (low)
  • Added tests (high)
  • Allow caching of content (low)
  • Extra other types (low) (for example, mp3 also works, let me know if something does not work)
  • Probably a naming issue with content type/default type
  • Choose inline or not somehow (high)
  • Make lxml module optional magic (high)
  • Provide automatic fallback for complex content(medium) (should work)
  • yagmail as a command on CLI upon install
  • Added feedback function on SMTP to be able to send me feedback directly :-)
  • Added the option to validate emailaddresses...
  • however, I'm unhappy with the error handling/logging of wrong emails
  • Logging count & mail capability (very low)
  • Add documentation to exception classes (low)
  • add raw and inline
  • oauth2
  • ~~Travis CI integration ~~
  • ~~ Add documentation to all functions (high, halfway) ~~
  • Prepare for official 1.0
  • Go over documentation again (medium)
  • Allow .yagmail file to contain more parameters (medium)
  • Add option to shrink images (low)

Errors

  • Make sure you have a keyring entry (see section No more password and username), or use getpass to register. I discourage to use username / password in scripts.

  • smtplib.SMTPException: SMTP AUTH extension not supported by server

  • SMTPAuthenticationError: Application-specific password required

  • YagAddressError: This means that the address was given in an invalid format. Note that From can either be a string, or a dictionary where the key is an email, and the value is an alias {'[email protected]': 'Sam'}. In the case of 'to', it can either be a string (email), a list of emails (email addresses without aliases) or a dictionary where keys are the email addresses and the values indicate the aliases.

  • YagInvalidEmailAddress: Note that this will only filter out syntax mistakes in emailaddresses. If a human would think it is probably a valid email, it will most likely pass. However, it could still very well be that the actual emailaddress has simply not be claimed by anyone (so then this function fails to devalidate).

  • Click to enable the email for being used externally https://www.google.com/settings/security/lesssecureapps

  • Make sure you have a working internet connection

  • If you get an ImportError try to install with sudo, see issue #13

Donate

If you like yagmail, feel free (no pun intended) to donate any amount you'd like :-)

PayPal

Owner
Pascal van Kooten
AI / Deep learning enthusiast
Pascal van Kooten
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