I don't think there is any free ones out there as bulk emails are sent from a server and that costs money. If you are marketing to 50,000 emails you should be getting enough sales (1-2% conversion) to afford a bulk email service.

try get response. They offer a 30 day free trial without credit card. I'm not sure if you can send 50,000 at once.

You could do it manually but could take a long time and most email providers set limits on how many emails they send.

I doubt, you'll find a free service.

If you get a VPS (Check with the host, to make sure they don't impose sending limits), set up a mail server (Free), use PHPList (Free)

This way your cost is limited to the price of the VPS.

[DELETED]

You can try with Mail Chimp Software for Bulk Mailing.

You won't find one for free,at least not a good one.

you'll find many that let you mail a certain quota per month for free.

or give you a limited subscriber quota, with a limited mailing quota per month, for free

look and you will find yours

[DELETED]

[DELETED]

[DELETED]

[DELETED]

Check out the following bulk softwares:

1. e-compaign

2. Big mass mailer

3. Maillist controller

4. Groupmail

5. Sendblaster

Cheers-James