I'd be careful with some of your ideas as they match more the practices of spammers than legitimate senders. I help people volume send for a living and I can tell you that spreading traffic around multiple hosting companies and using domain names other than your own are generally considered red flags. Instead get one good quality server on one hosting service, pick up maybe 10 IP addresses at the most to send through and go with it.
DKIM setup will depend on the MTA you use so you'll have to check with the docs for what you are using.
Remember that double opt-in is key, it will save you a lot of headaches.
You're on the right track, I've setup a lot of volume senders and most of what you have planned are best practices.
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by: tristancomputesPosted on 2009-02-27 at 17:48:33ID: 23761244
In regards to DKIM, check out this webpage for deployment information: http://www.dkim.org/deploy
In terms of SPF, it's simply a matter of adding some records to the domain's DNS. Use the wizard at http://www.openspf.org/ to help get you started writing your own SPF records depending on the hosts that will be send the mail on the domain's behalf.
I'd be very cautious about the domain you use in sending the messages. Even if your users asked to receive this mail, if it doesn't come from a domain that they are expecting, they are likely to flag it as spam anyways. Also, if a portion of users flag the message as spam, then your domain could become useless in a number of days (especially with such a large volume of email), since spam engines will weigh in the volume of mail that is hitting the internet, and the percentage of messages from your domain that users classified as spam.
Of course, if you are sure that all your users will think this email is completely legitimate, then you shouldn't worry about this point to much. It seems like you have definitely though this through, and that you're on the right track. Also, be sure not to send any messages from an account such as nobody@ or root@ etc, as it will likely be picked as spam right away. Otherwise, as long as you have valid reverse DNS in place, and your e-mail continues to be legitimate, you shouldn't have a problem.
Be sure the ISP that you are using will not have a problem with such a large quanitty of e-mail being sent using their network. They should be aware, as they will likely receive network abuse complaints if any of it is flagged as spam. Be sure to make it clear in each e-mail how the e-mail address you are sending to was obtained, and how the user can remove themsevles from the list permanently.