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This question comes from: http://webmasters.stackexchange.com/questions/695/how-to-avoid-hotmail-live-rejections-for-legit-large-volume-emailing

I never knew about this for Hotmail and I'm wondering if there are similar services for Google, Yahoo or others. I work on a few newsletter managers and I want to make sure the emails are getting to their recipients.

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Coding Horror had a pretty thorough discussion of sending e-mail through code. It includes a reference to the Port 25 verifier that might be useful.

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