These are calls where the caller’s service provider verified the call is coming from a non-spoofed telephone number. Because we provide all domestic long-distance service, it’s not possible for a fraudulent company to change your long-distance provider. You shouldn’t receive a separate bill...
554 - [PTR lookup failure] Comcast requires all sending mail server IP addresses have a valid PTR record set up. This error results when the lookup failed. NXDOMAIN response. One of the authoritative servers for the relevant section of the in-addr.arpa DNS tree is saying that there is no...
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