There is a particular frustration in sending a newsletter to three thousand people and watching the open rate sit at four percent. You wrote something useful. The list was built honestly. And almost nobody saw it.

Before you rewrite the content, check whether it arrived at all.

Email deliverability is the least glamorous part of digital marketing and one of the most consequential. A campaign that lands in spam is not a campaign with a copywriting problem. It is a campaign that never happened. Yet most businesses only investigate after months of declining results, by which point the damage to their sender reputation takes a while to undo.

Key Insight

Most email that fails to reach the inbox fails for technical reasons that were never set up correctly, not because the content was poor. Authentication, list hygiene and sending behaviour decide whether your message is read.

Mailbox providers have quietly raised the bar

For years, sending marketing email was forgiving. You could send from almost any address, through almost any platform, and most of it would arrive somewhere near the inbox.

That era has ended. The major mailbox providers, including Google and Microsoft, have progressively tightened their requirements for anyone sending in volume. The direction of travel is consistent. They want senders to prove who they are, they want unsubscribing to be one click, and they want complaint rates kept very low.

The important shift is that these are no longer best practice suggestions. They are conditions of delivery. A business that ignores them does not get a warning email. It gets a slow decline in results that looks, from the inside, like audience apathy.

The three records that prove you are who you say you are

Email authentication rests on three DNS records. They sound technical, and the setup is technical, but the concept is straightforward. Each one answers a question a receiving mail server asks about your message.

  • SPF answers “is this server allowed to send email for this domain”. It is a published list of the services you have authorised, such as your mail host and your marketing platform.
  • DKIM answers “has this message been tampered with in transit”. It attaches a cryptographic signature that the receiving server checks against a key published in your DNS.
  • DMARC answers “what should happen if the first two checks fail”. It also tells receiving servers where to send reports, which is how you find out who is sending email in your name.

If those three are missing or misconfigured, you are asking a mailbox provider to trust an unverified stranger. Increasingly, it will not.

The most common fault we see is an SPF record that was correct three years ago and has never been updated. The business signed up for a new CRM, started sending from it, and nobody added it to the list of authorised senders. Everything from that platform is now unauthenticated.

The second most common fault is a DMARC record set to a monitoring only policy and left there indefinitely. That is the right starting point. It is not the finishing point.

Your domain reputation is an asset you can damage

Mailbox providers keep a running assessment of every sending domain. It is not published, and you cannot see your score, but you can see its effects.

A few behaviours degrade it quickly.

  • Sending to purchased or scraped lists, where complaint and bounce rates are high.
  • Continuing to email addresses that have bounced repeatedly.
  • Sending to old lists that have sat untouched for a year or more.
  • A sudden jump in volume from a domain with no sending history.
  • High complaint rates, which usually means the unsubscribe link is hard to find.

That fourth point catches out businesses moving to a new platform. You import twelve thousand contacts, send to all of them on day one from a fresh sending domain, and the pattern looks exactly like a spam operation. Warming up a new domain over several weeks, starting with your most engaged contacts, avoids a problem that is far harder to fix afterwards.

Why your engaged subscribers protect everyone else

Here is something that surprises a lot of business owners. Mailbox providers pay close attention to whether recipients actually engage with your email. Opens, replies, moving a message out of spam, adding you to contacts. All of it counts.

This creates a compounding effect. If you keep emailing people who never open anything, your average engagement falls, and your messages start landing lower for the people who do want to hear from you. The unengaged portion of your list is not neutral. It is actively working against you.

The fix feels counterintuitive to anyone who has spent years building a list. You need to remove people. Run a re-engagement campaign to anyone who has not opened in six months, then suppress the ones who still do not respond. A list of two thousand engaged readers outperforms a list of eight thousand where six thousand are dormant, every single time.

What a healthy sending setup looks like in practice

For most Australian service businesses, the working setup is not complicated.

Use a dedicated subdomain for marketing email, something like news.yourbusiness.com.au, so a campaign problem never threatens your ability to send quotes and invoices from your main domain. Authenticate that subdomain properly with all three records. Keep your CRM or marketing platform as the single sending source rather than scattering campaigns across three tools, which carries the hidden cost of disconnected marketing tools.

This is the same discipline that keeps email nurture sequences performing. Make unsubscribing genuinely easy. Burying the link in six point grey text does not keep subscribers. It converts people who would have quietly unsubscribed into people who hit the spam button, and that is the outcome you least want.

Send consistently rather than in bursts. A monthly newsletter that actually goes out every month builds a healthier pattern than four campaigns crammed into December.

Platforms such as Go High Level handle much of the sending infrastructure once the DNS side is configured correctly, which is why the setup step matters more than the platform choice. Most deliverability problems we are asked to investigate turn out to be DNS problems, not platform problems. This connects directly to how marketing automation supports lead generation, because an automation sequence that never reaches the inbox is just a diagram.

How to work out whether you have a problem right now

You do not need to guess. A few checks give you a clear picture within an afternoon.

  • Look at your platform’s delivery rate, not just the open rate. Anything below about ninety five percent delivered deserves investigation.
  • Send a test to a Gmail, an Outlook and a Yahoo address and see where each one lands.
  • Check whether your DMARC reports are going anywhere. If nobody has ever read them, that is your answer.
  • Compare open rates by mailbox provider. If Gmail is at thirty percent and Outlook is at three percent, you have a Microsoft specific delivery issue, not a content issue.
  • Look at your bounce list. Repeated hard bounces still sitting in your active list are a reliable warning sign.

Key Takeaways

  • Poor email results are more often a delivery problem than a content problem, and the two need to be diagnosed separately.
  • SPF, DKIM and DMARC are now effectively conditions of delivery for anyone sending in volume.
  • An outdated SPF record after adding a new sending platform is the single most common technical fault.
  • Dormant subscribers actively harm inbox placement for the people who do want your email.
  • Sending marketing email from a dedicated subdomain protects your ability to send quotes and invoices.
  • Delivery rate by mailbox provider is the fastest way to identify where the problem sits.

FAQs

Q: How do I know if my emails are going to spam?

Compare your delivery rate with your open rate, and then break the open rate down by mailbox provider. A high delivery rate with very low opens at one specific provider usually means filtering rather than disinterest. Sending test messages to accounts at each major provider gives you a quick manual confirmation.

Q: Do I need DMARC if I already have SPF and DKIM?

Yes. SPF and DKIM perform the checks, but without DMARC you are not telling receiving servers what to do when a check fails, and you receive no reporting. DMARC is also what stops other parties sending email that appears to come from your domain, which is a security issue as much as a marketing one.

Q: Should I send marketing email from my main business domain?

A dedicated subdomain is safer. It keeps your marketing sending reputation separate from the domain you use for quotes, invoices and client correspondence. If a campaign causes a problem, your day to day business email is unaffected.

Getting Your Email Back Into the Inbox

Email remains one of the cheapest channels available to an Australian service business, and the one most often written off on numbers that were never measuring the right thing. Before you conclude the list has gone cold, confirm it is receiving the mail.

Most of the deliverability problems we are asked to look at are found within an afternoon, because they sit in DNS records rather than anywhere mysterious. XDesigns Advertising reviews sending setups, corrects authentication, separates marketing sending from your business domain and cleans the list so the people who want your email get it. If your open rates have been sliding, send us the domain you send from and we will check what the mailbox providers can currently see.