On 09/07/2020 14:21, @lbutlr wrote:
Given a domain that is hosted and used for email and web, is an A
record for that domain actually required?
It's not *required*. But see below.
That is, if bob.tld is hosted by example.com can you simply have
NS ns1.example.com
NS ns2.example.com
MX mx.example.com
www CNAME www.example.com
Without specifying
A 11.22.33.444
These days, many folk try to reach websites by typing just the bare
domain name without the "www" prefix.
If a user types "bob.tld" into a browser, the browser will issue an
address lookup for "bob.tld", causing the resolver to ask for A and AAAA
records for "bob.tld". If you don't have an A record at the zone apex,
the browser will not get back any address and display an error message
for the user. An alert user might try "www.bob.tld" but most users are
likely to just give up.
So while it's not *required* to have an address record at the apex, it's
good practice to have one.
Anand
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