MX record

It's how the www version of your web address follows the main one.

An MX record, short for mail exchange, says where your email for your domain gets delivered.

And notice what that separation means.

The website and the email are separate deliveries to separate destinations, which is exactly why one can break while the other works perfectly, and why Move 1 told you to suspect DNS when email breaks alone.

Well, it turns out.

Thanks to Claude, I did an analysis of their DNS, their MX records, and I learned that they are using Barracuda networks.

And this is evident in their MX records.

So I'm like, aha, I've used Barracuda spam filtering before.

And while it is kind of good, it adds one more relatively complex layer in your network chain for your mail delivery.

We're getting a 550 bounce.

And it's not your typical undeliverable.

It's not like MX unreachable.

Getting a mail server to send email is easy.

You provision a box, run an installer, point an MX record at it, send a test, and something arrives somewhere.

That part took an afternoon.

Getting a mail server that Gmail will put in someone's inbox is a completely different job, and it is mostly not about the mail server.

You can run DNS on the box with PowerDNS, or leave it at your registrar or Cloudflare.

I would leave it where it already is, because putting your authoritative DNS on the same single server as your mail means one outage takes out both.

Five records: type name value Y your server IP the forward half of reverse DNS MX, priority ten, where inbound mail goes TXT SPF TXT or DKIM public key DKIM text mark the last three are where the real work is, and they get their own sections below.

One note on Cloudflare if you use it, the A record must be DNS only, gray cloud, not proxied.

It's always the grammar part that trips me up.

Available records are A, Quad A, CNAME, MX, and TXT.

There we go.

So we've got that there.

And again, if you think you know the answer, go to the link on your screen, professormesser.com.qa.

Submit your answer for each of these DNS records.

One good thing about this particular question, I made it a little bit easier than an actual exam, which I think may be good or may be bad because there are five records up here, the A, the quad A, the C name, the MX, and the TXT.

There are also five tickets.