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Welcome to the forum.
I can setup the PTR, if static IP range is lease from Comcast.
Please send me the following information via private message to assist:
RNDS (PTR) dns entry record - example: 188.8.131.52 -> alert.mydomain.com.
To send a PM. Click on the user name and then click the link on the right <send this user a private message>. Messages link/box at the top indicates mail received.