Trying again on SERVFAIL

[Alessandro Vesely]

Hi,

is there a way to know that a query has already been tried a few minutes ago, 
and failed?

It happens seldomly, but sometimes the DKIM mail filter gets a SERVFAIL when it 
tries to authenticate an incoming message.  SERVFAIL occurs when DNSSEC check 
fails.  Trying again is useless, it has to be treated as a permanent error.

Any idea about how to tell a really temporary error?

Best
Ale
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