Merge branch '3-support-multiple-recipients' into 'master'

#3: Add support for space separated recipient list

See merge request ix.ai/grafana-email!17

README.md

@@ -25,7 +25,7 @@ You can see the panel url by selecting `Share` in a panel menu (click on its nam
 | `GRAFANA_TOKEN`       | -                      | **YES**       | the authentication token for Grafana |
 | `GRAFANA_DASHBOARD`   | -                      | **YES**       | the short code for the dashboard (example: **`gV6maGVZz/e-mail-reports`**) |
 | `SMTP_FROM`           | -                      | **YES**       | the e-mail address of the sender |
-| `SMTP_TO`             | -                      | **YES**       | the e-mail address of the receipient |
+| `SMTP_TO`             | -                      | **YES**       | the e-mail address of the receipient. Alternatively, a space separated list of recipients. |
 | `SMTP_PORT`           | `25`                   | NO            | the port for the SMTP host |
 | `SMTP_HOST`           | `localhost`            | NO            | the SMTP host |
 | `SMTP_SUBJECT`        | `Grafana Email Report` | NO            | the e-mail subject |

grafana-email/grafana-email.py

@@ -29,7 +29,7 @@ def __init__(self):
 
         # These are mandatory
         self.smtp['from'] = os.environ['SMTP_FROM']
-        self.smtp['to'] = os.environ['SMTP_TO']
+        self.smtp['to'] = os.environ['SMTP_TO'].split(' ')
         self._token = os.environ['GRAFANA_TOKEN']
         self.grafana['dashboard'] = os.environ['GRAFANA_DASHBOARD']  # Example: gV6maGVZz
 
@@ -58,7 +58,7 @@ def __init__(self):
 
         self.message['Subject'] = os.environ.get('SMTP_SUBJECT', 'Grafana Email Report')
         self.message['From'] = self.smtp['from']
-        self.message['To'] = self.smtp['to']
+        self.message['To'] = ', '.join(self.smtp['to'])
 
         LOG.debug(f'Panel options: {self.panel_args}')
         LOG.debug(f'SMTP options: {self.smtp}')