DNS: List MX servers for domains
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Given a list of domains, collect the MX servers using DNS and output one row per MX server and the following fields:
· AUTO_SEQ_ID (Starting with 1 then 2 and so on)
· Domain (from input file)
$ dig mx +short [url removed, login to view]
Provide all the records of mx but mark the highest Priority one for each domain. If there are multiple servers with the same highest priority – Mark the one with the shortest field length.
So the output for the above example is as follows:
1,[url removed, login to view],200,[url removed, login to view],Y
2,[url removed, login to view],250,[url removed, login to view],N
3,[url removed, login to view],600,[url removed, login to view],N
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