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Improve MX lookup: resolve MX hosts to IPs #972

@CodeAlDente

Description

@CodeAlDente

Please describe your feature request:

It would be useful if dnsx could optionally resolve MX records all the way to their A/AAAA IPs in a single run. Right now it only returns the MX hostnames, so you have to pipe the results into another dnsx call to get the IPs.

Maybe something like a -mx-resolve flag (or extending -mx) that automatically resolves the returned MX hosts.

Describe the use case of this feature:

When doing recon or asset mapping, you usually care about the actual mail server IPs, not just the hostnames. Having this built-in would simplify workflows and avoid chaining commands, especially when working with large domain lists.

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Type: EnhancementMost issues will probably ask for additions or changes.

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