Opening an email in the admin site connects to the mail server

[pdewacht]

If you open an email in the Django admin site, django-post-office attempts to create a connection to the mail server, and crashes if that doesn't work. I see no reason why this should be needed, and it's inconvenient in a dev setup where no mail server might be available.

To reproduce:

• Start a new django project (django-admin startproject)
• Follow the installation steps in this project's README (configure INSTALLED_APPS and EMAIL_BACKEND)
• Create an email as described in the Quickstart
• Try to open the email in the admin site (/admin/post_office/email/)
• Notice that django-post-office attempts to create an SMTP connection to the mail server.

[e-Dan-K]

To potentially help with debugging/fixing, I believe this only happens if the email contains an html_message.

[presidento]

By the way, for the dev environment I suggest using the console backend if the mail server is not available. In settings.py:

EMAIL_HOST = load_from_a_noncommitted_config_file()

POST_OFFICE = {
    "BACKENDS": {
        "default": (
            "django.core.mail.backends.smtp.EmailBackend"
            if EMAIL_HOST
            else "django.core.mail.backends.console.EmailBackend"
        )
    }
}