[exim] dns_ question..

It seems that njabl's dnsbl is having issues and has been having issues
today..

So I've been trying to change the values of dns_retry and dns_retrans
and I just want to make sure I have this right..

dns_retrans is how much time it will wait for dns answer (globally not
just dnslists) and dns_retry is how many times it will retry?

so if I have dns_retrans = 7s and dns_retry = 1, this means after 7
seconds I will retry one more time, wait 7 more seconds then move on right?

Thanks in advance