"""A simple email backend, which only prepends all subjects with a string.

Used to distinguish testing emails from production ones."""

# We try to monkeypatch django.core.mail.backends.smtp :-)

from django.core.mail.backends.smtp import EmailBackend as DjangoSMTPBackend

class PrefixingMailBackend(DjangoSMTPBackend):
	# method _send is not probably meant to be monkey_patched, so we patch send_messages instead.
	def send_messages(self, messages):
		prefix = '[Mail z testwebu]'
		for message in messages:
			# We hope that this is a django.core.mail.message.EmailMessage
			message.subject = prefix + ' ' + message.subject
		return super().send_messages(messages)