#34414: Connection to SMTP server not closed after exception
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Reporter: chamalsl | Owner: nobody
Type: Bug | Status: new
Component: Core (Mail) | Version: 4.1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Django EmailMessage class does not close connection to SMTP server, when
an exception is raised.
{{{
email_msg = EmailMessage(subject="Topic\n", body="Body",
from_email="[email protected]",
to=["[email protected]"])
email_msg.send()
}}}
Above Django/python code sends an email. But the email's subject contains
a new line.
So Django will raise a BadHeaderError. But the connection to the SMTP
server is not closed.
== Steps
1. Create a Django app.
Add this method to a view.
{{{
def email(request):
email_msg = EmailMessage(subject="Topic\n", body="Body",
from_email="[email protected]",
to=["[email protected]"])
email_msg.send()
return HttpResponse("Sent")
}}}
* Note: There is a new line character in the email subject.
2. Install aiosmtpd
{{{
python3 -m pip install aiosmtpd
}}}
3. Run smtpd server
This will start a SMTP server on port 8025
{{{
python3 -m aiosmtpd -n
}}}
4. Add these lines to settings.py of your Django app.
{{{
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'localhost'
EMAIL_PORT = 8025
}}}
5. Open attached send_emails.py
Change URL in this line to match your application's URL.
{{{
requests.get('http://localhost:8080/file/email')
}}}
6. Run send_emails.py
This script will make 10 requests to send email.
{{{
python3 send_emails.py
}}}
7. Check connections to port 8025 (SMTP server)
{{{
netstat -at | grep 8025
}}}
You can see some connections are in ESTABLISHED state.
8. Remove the new line character inside the "def email" method.
Run send_emails.py.
Then run
{{{
netstat -at | grep 8025.
}}}
You will see all connections are in TIME_WAIT state.
--
Ticket URL: <https://code.djangoproject.com/ticket/34414>
Django <https://code.djangoproject.com/>
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