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Comment Re:Better Question... (Score 2) 301

You don't have to choose the record. The ISP just has to ensure that the PTR for an IP resolves to a name, and the A for that name resolves to the original IP. The name can be completely up to them and doesn't even need to reflect the domain for which you're sending mail. However it should avoid using a name that makes it appear to be a dynamic IP, which some receivers may penalize you for.

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