Email Configuration

You can configure the email that is being sent in your airflow.cfg by setting a subject_template and/or a html_content_template in the [email] section.

[email]
email_backend = airflow.utils.email.send_email_smtp
subject_template = /path/to/my_subject_template_file
html_content_template = /path/to/my_html_content_template_file

Equivalent environment variables look like:

AIRFLOW__EMAIL__EMAIL_BACKEND=airflow.utils.email.send_email_smtp
AIRFLOW__EMAIL__SUBJECT_TEMPLATE=/path/to/my_subject_template_file
AIRFLOW__EMAIL__HTML_CONTENT_TEMPLATE=/path/to/my_html_content_template_file

You can configure a sender's email address by setting from_email in the [email] section like:

[email]
from_email = "John Doe <johndoe@example.com>"

Equivalent environment variables look like:

AIRFLOW__EMAIL__FROM_EMAIL="John Doe <johndoe@example.com>"

To configure SMTP settings, checkout the :ref:`SMTP <config:smtp>` section in the standard configuration. If you do not want to store the SMTP credentials in the config or in the environment variables, you can create a connection called smtp_default of Email type, or choose a custom connection name and set the email_conn_id with it's name in the configuration & store SMTP username-password in it. Other SMTP settings like host, port etc always gets picked up from the configuration only. The connection can be of any type (for example 'HTTP connection').

If you want to check which email backend is currently set, you can use airflow config get-value email email_backend command as in the example below.

$ airflow config get-value email email_backend
airflow.utils.email.send_email_smtp

To access the task's information you use Jinja Templating in your template files.

For example a html_content_template file could look like this:

Try {{try_number}} out of {{max_tries + 1}}<br>
Exception:<br>{{exception_html}}<br>
Log: <a href="{{ti.log_url}}">Link</a><br>
Host: {{ti.hostname}}<br>
Mark success: <a href="{{ti.mark_success_url}}">Link</a><br>

Send email using SendGrid

Using Default SMTP

You can use the default airflow SMTP backend to send email with SendGrid

[smtp]
smtp_host=smtp.sendgrid.net
smtp_starttls=False
smtp_ssl=False
smtp_user=apikey
smtp_password=<generated-api-key>
smtp_port=587
smtp_mail_from=<your-from-email>

Equivalent environment variables looks like

AIRFLOW__SMTP__SMTP_HOST=smtp.sendgrid.net
AIRFLOW__SMTP__SMTP_STARTTLS=False
AIRFLOW__SMTP__SMTP_SSL=False
AIRFLOW__SMTP__SMTP_USER=apikey
AIRFLOW__SMTP__SMTP_PASSWORD=<generated-api-key>
AIRFLOW__SMTP__SMTP_PORT=587
AIRFLOW__SMTP__SMTP_MAIL_FROM=<your-from-email>

Using SendGrid Provider

Airflow can be configured to send e-mail using SendGrid.

Follow the steps below to enable it:

1. Setup your SendGrid account, The SMTP and copy username and API Key.
2. Include sendgrid provider as part of your Airflow installation, e.g.,

pip install 'apache-airflow[sendgrid]' --constraint ...

or

pip install 'apache-airflow-providers-sendgrid' --constraint ...

3. Update email_backend property in [email] section in airflow.cfg, i.e.

   [email]
   email_backend = airflow.providers.sendgrid.utils.emailer.send_email
   email_conn_id = sendgrid_default
   from_email = "hello@eg.com"
   

   Equivalent environment variables looks like

   AIRFLOW__EMAIL__EMAIL_BACKEND=airflow.providers.sendgrid.utils.emailer.send_email
   AIRFLOW__EMAIL__EMAIL_CONN_ID=sendgrid_default
   SENDGRID_MAIL_FROM=hello@thelearning.dev
   

4. Create a connection called sendgrid_default, or choose a custom connection name and set it in email_conn_id of 'Email' type. Only login and password are used from the connection.

Send email using AWS SES

Airflow can be configured to send e-mail using AWS SES.

Follow the steps below to enable it:

1. Include amazon subpackage as part of your Airflow installation:

pip install 'apache-airflow[amazon]'

2. Update email_backend property in [email] section in airflow.cfg:

   [email]
   email_backend = airflow.providers.amazon.aws.utils.emailer.send_email
   email_conn_id = aws_default
   from_email = From email <email@example.com>
   

Note that for SES, you must configure from_email to the valid email that can send messages from SES.

3. Create a connection called aws_default, or choose a custom connection name and set it in email_conn_id. The type of connection should be Amazon Web Services.