Windows Server PHP mail being blocked by Comcast/AOL

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I have a windows server running an application which sends mail via PHP. Some of the people who should be recieving the emails are complaining they are not getting them. I think they are using Comcast or AOL. What can I do to my SMTP settings and/or DNS to allow these to go through?

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Investigate SPF (Sender Protection Framework) to increase the authenticity of your emails.