Frequently asked questions
Why do you always canonicalise hostnames? ∞
You might have noticed that when we generate zone files, we canonicalise
whatever you enter into the hostname field on records that have it (like CNAME
and MX) by adding a
. at the end if one was not added by you.
We do this, because only people with a deep understanding of DNS would know to
. themselves. While a DNS server would expect
mail.test to be a
non-qualified domain name, and if you added such a host name to a CNAME on your
example.com. zone, it would be interpreted as
mail.test.example.com. – but
URLs and most other tools using host names do not follow this convention.
So we have decided to apply the principle of least astonishment and interpret
all host names as canonical by default. You enter the host name as
if you want it to be relative to the zone name. This is also very useful when
working with rule sets.