unresolvable name: nameserver

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That sounds to me as somewhere within your system configuration, or maybe in one of the mails you check, there is the word nameserver, occurring as a value of a nameserver to contact.

Most likely something somewhere is misconfigured, but it's hard to see where, as we don't know your system configurations and the mails you're checking SPF on.

In reply to Re: DNS problems with Mail::SPF by Corion
in thread DNS problems with Mail::SPF by nifu

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