[AusNOG] PTR Records

[Scott Howard]

On Mon, Nov 17, 2014 at 6:18 PM, David Beveridge <dave at bevhost.com> wrote:

> And for the record, yes, the EHLO header was mycompany.com.au and it
> does have a normal A record.
>

In that case, whilst your provider isn't correct - it's probably a good
idea to listen to them.

Having an email server with the hostname example.com is legal, and in that
case you would want to PTR record to go to the same hostname - but it's a
really bad idea.

Like it or not, example.com has become synonymous with www.example.com, so
the expectation is that you'll have a web server running on example.com.

Now, perhaps your web server is on the same IP as your email server (or
perhaps you don't have a web server today?!) - but why lock yourself into a
naming scheme when there's no need to do so. Having example.com and
mail.example.com (or even fred.example.com if you don't like using generic
names) on the same IP might sound like a little bit more work today, but
the day that you decide to move your webserver somewhere else you're going
to appreciate having done it that way.

  Scott
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