reuse connection to send multiple emails in django

django_email_sending.py

from django.core import mail
connection = mail.get_connection()

connection.open()

email1 = mail.EmailMessage(
    'That’s your subject',
    'That’s your message body',
    '[email protected]',
    ['[email protected]'],
    connection=connection,
)
email1.send()

email2 = mail.EmailMessage(
    'That’s your subject #2',
    'That’s your message body #2',
    '[email protected]',
    ['[email protected]'],
)
email3 = mail.EmailMessage(
  'That’s your subject #3',
    'That’s your message body #3',
    '[email protected]',
    ['[email protected]'],
)

connection.send_messages([email2, email3])
connection.close()

send_multiple_with_send_mass_mail.py

message1 = ('That’s your subject #1', 
 'That’s your message body #1',
 '[email protected]',
 ['[email protected]', '[email protected]'])
message2 = ('That’s your subject #2',
 'That’s your message body #2',
 '[email protected]',
 ['[email protected]'])
message3 = ('That’s your subject #3',
 'That’s your message body #3',
 '[email protected]',
 ['[email protected]'])
send_mass_mail((message1, message2, message3), fail_silently=False)

test.py

from django.core import mail
from django.test import TestCase

class EmailTest(TestCase):
    def test_send_email(self):
        mail.send_mail(
            'That’s your subject', 'That’s your message body',
            '[email protected]', ['[email protected]'],
            fail_silently=False,
        )

        self.assertEqual(len(mail.outbox), 1)        
        self.assertEqual(mail.outbox[0].subject, 'That’s your subject')
        self.assertEqual(mail.outbox[0].body, 'That’s your message body')