We just had a problem where a BIND9 running on our postfix MX 
451-rejected-as-unknown-domain all msgs from @sender.domain for 9 days. 

"rndc flush" allowed the domain to be resolved immediately and its messages 
accepted.

When the BIND reports "server fail", rather than a negative answer with 
neg-TTL, how long is SRV FAIL cached in BIND9?   RFC2308 says "no longer than 5 
minutes".

We do not know whether unknown domain's NS was really SRV FAIL for 9 days.

Len

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