Ask HN: Sending thousands of emails all at once. how?

Do you think it's a good idea to send 80k emails all at once from the same server

Not a good idea. We've had problems getting blocked by certain ISPs when a forum thread gets popular and the server tries to send out too many notifications to users with the same ISP.

Better to outsource it to someone else who has figured out all of the kinks.

You could try SendGrid http://sendgrid.com/

"Never send more than 4 emails per minute" is on my golden rules list, right under "never roll your own crypto", and for much the same reason - it's too easy to make a mistake and have to live with dire consequences. Just over 5k per day, queued at 4 per minute, or outsource. Use that worry-time for something more productive :)