DNS-gåta

I morse fick jag ett samtal av en klient, som bad mig komma för att titta till en e-postserver som slutat fungera. Klientens internetleverantör hade haft ett avbrott, men trots att anslutningen nu var i skick, anlände ingen e-post.

Jag var nästan på väg då jag bestämde mig för att kolla en sak till - och tack vare denna koll kunde jag stanna:

$ dig +short xyz.com mx
10 mail.xyz.com.xyz.com.
20 mail2.xyz.com.xyz.com.

Det såg inte rätt ut. Jag sade till klienten att deras MX-poster var felaktiga, men fick svaret att pekarna enligt klientens eget DNS-redskap var korrekta:

Jag instruerade min klient att radera ".xyz.com", men det gick inte att göra, för DNS-redskapet klagade över att namnet var ogiltigt. - Nu drog jag på smilbandet, för det gick upp för mig vad som behövdes.

Kommer du på vad klienten måste göra för att åtgärda problemet?

Svar

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