Hello everybody,

mxtoolbox says that my SMTP is slow: http://mxtoolbox.com/domain/sulweb.org/
It's a Debian GNU/Linux 8.1 64bit kvm guest, 6 vCPUs, 2GB of RAM and a 
load average that is almost always below 0.5.
iptables blocks OUTPUT to 113/tcp with REJECT.
"courier show all" shows only one domain (that doesn't go away with 
"courier clear all" but that's another problem, because the blacklisted 
domain has nothing to do with mxtoolbox).
There aren't any DNS block lists configured.
The configured DNS is a local Bind9 with recursion.

What is taking nearly 13 seconds to complete the transactions that 
mxtoolbox expects to complete in less than 5 seconds?



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