I have a Slicehost slice running django through nginx and apache. This is for a project in which email marketing is a key component. We will need to be able to send up to 10,000 emails in a day from this Django app. We need to recieve email as well, however, that can simply be a forwarder.
What would be your recommended solution? would you setup a postfix mail server on the slice or try to use some 3rd party mail service with an API like MailChimp or constant contact?
Sending thousands of emails from your own machine in a reliable way is very hard.
I would recommend you to use SendGrid. You can use them as a smtp server, so there's no need to code against APIs. They can also receive email and POST the data to a URL on your server.