rDNS Setup

By mfdelavergne ·
Could anyone help me? I am trying to get rDNS setup. My DNS Server (and Domain Controller) IP is, the emailing program I am using is butting heads with comcast (seemingly with my EXTERNAL IP if that makes any sense), and I cannot seem to get this to send to comcast emails..

First of all, how long does it take for A and PTR records to set in? I may have everything set but haven't waited long enough?

Second of all, when I'm setting the host (a record), should it be, or my external IP??

Thank you for any help!

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