On 03/08/2010 10:45 PM, John Black wrote:
You can use SPF, DomainKeys plus valid DNS information. I have setup SPF records for my domains. If you attempt to send E-Mail as if it was sent from my server then any server doing SPF record checking will not accept or simply drop your message. I have not setup DomainKeys since SPF has served me well but I will configure it soon.
woops, forgot to add that I doubt that you'll be able to get a pure webserver to do this for you, reliably, since some smtp servers will call your server back and check if the e-mail account exists. I'd assume that the server will drop the mail if your script sending server is not even running smtp on port 25.
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