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https://issues.apache.org/jira/browse/AIRFLOW-3012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16604822#comment-16604822
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Kaxil Naik commented on AIRFLOW-3012:
-------------------------------------

[~ashb] I don't see this as a bug, it is expected behavior. It is because you 
are passing string "ema...@example.com, ema...@example.com" to {email}. You can 
do the following if you want to use this string as an array:

{code:python}
email = Variable.get("test_recipients")
args = {
    'owner': 'airflow'
    , 'depends_on_past': False
    , 'start_date': datetime(2018, 8, 20, 0, 0)
    , 'retries': 0
    , 'email': [email] # This will convert the string to python list
    , 'email_on_failure': True
    , 'email_on_retry': True
    , 'sla': timedelta(seconds=10)
}
{code}


In general, if you want to send emails to multiple emails, you should always 
use list and not string.

> Email on sla miss is send only to first adress on the list
> ----------------------------------------------------------
>
>                 Key: AIRFLOW-3012
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3012
>             Project: Apache Airflow
>          Issue Type: Bug
>    Affects Versions: 1.9.0
>            Reporter: Marek Kowal
>            Priority: Major
>
> Description:
> I store email recipients as a variable, test_recipient: te...@test.com, 
> [te...@test.com|mailto:te...@test.com]
> With such dag definition:
> {code:java}
> email = Variable.get("test_recipients")
> args = {
>     'owner': 'airflow'
>     , 'depends_on_past': False
>     , 'start_date': datetime(2018, 8, 20, 0, 0)
>     , 'retries': 0
>     , 'email': email
>     , 'email_on_failure': True
>     , 'email_on_retry': True
>     , 'sla': timedelta(seconds=10)
> }{code}
> On sla miss email is send only to the first person on the list, in my example 
> [te...@test.com|mailto:te...@test.com]
> to reproduce:
> create email list variable as string and wait for sla miss



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