Getting "SMTPServerDisconnected: Connection unexpectedly closed: [Errno 104] Connection reset by peer" errors when using django.core.mail.send_mail in the loop

Create a command like below, which send a mail to the user if the date meet the requirement:

class Command(BaseCommand):

    help= 'Send mail to user regularly if there have contacts needs reminder'

    

    def handle(self, *args, **options):

        now = timezone.now().date()

        backlogs = Backlog.objects.all()

        for backlog in backlogs.iterator():

            start_date = backlog.start_date

            end_date = backlog.end_date

            if start_date <= now and now < end_date:

                user = backlog.user

                user_email = user.email

                user_name = user.username

                if user_email is not None:

                    mail_title = u'Contracts need to be handling.'

                    mail_content = u"Dear:%s，you have messages" % user_name

                    link = u"http://xx.xxx.xx.xxx/contract-info/"

                    mail_content += link;

                    mail_from = 'from_email@xx.com'

                    mail_to = [user_email]

                    send_mail(mail_title,

                          mail_content,

                          mail_from,

                          mail_to)

This command can run well in local server. But when I launch it on the VPS and if call send_mail more than once, below mesasge appear:

"SMTPServerDisconnected: Connection unexpectedly closed: [Errno 104] Connection reset by peer"

But if only one backlog been filtered and only call once send_mail, it works well.

Does anybody met the issue before? thanks in advance!

-Haomin

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