A business I work with sent over 16,000 marketing emails in a single month.
They had a decent list. Good products. Reasonable offers.
The click rate? 0.7%. Total sales from those 16,000 emails? Twelve.
Twelve sales from sixteen thousand emails.
The obvious question is: what went wrong with the offer? The subject lines? The copy?
Maybe. But there’s a bigger question nobody is asking.
How many of those 16,000 emails actually landed in someone’s inbox?
“Delivered” Doesn’t Mean “Received”
Most email platforms will tell you something like “99.2% delivered.” That sounds great, but it’s also misleading.
“Delivered” means the email didn’t bounce. It reached the recipient’s mail server. That’s it.
It says nothing about where the email ended up. Inbox? Spam folder? Promotions tab? A black hole where nobody will ever see it?
The metric that actually matters is inbox placement rate. That’s the percentage of emails that land in the primary inbox where someone might actually read them.
Most businesses never check this number. They see “99% delivered” and assume everything’s fine.
It’s not.
The 2026 Numbers Are Worse Than You Think
Unspam.email publishes an annual benchmark report tracking email deliverability across millions of emails worldwide. The 2026 data is sobering.
Globally, only 65% of marketing emails reach the inbox. The other 35% land in spam, get filtered, or vanish entirely.
The breakdown by email provider makes it worse:
| Provider | Inbox Rate | Spam Rate |
|---|---|---|
| Gmail | 73% | 27% |
| Outlook | 48% | 52% |
| Yahoo | 23% | 78% |
| AOL | 26% | 74% |
More than half of all marketing emails sent to Outlook addresses go to spam. Not a niche issue. Outlook is the default for most Australian businesses.
Yahoo and AOL are even worse. Nearly 4 out of 5 emails never reach the inbox.
Now think about that business sending 16,000 emails. If even a quarter of their list uses Outlook, thousands of those emails were dead on arrival. Nobody ignored them. Nobody unsubscribed. They simply never appeared.
Why Authentication Alone Won’t Save You
You might have heard that setting up SPF, DKIM, and DMARC will fix your email problems. These are technical protocols that prove you’re a legitimate sender, not a scammer spoofing your domain.
They’re essential. You need them. But they’re not enough.
According to the Unspam benchmark, 93% of senders now have SPF configured. 90% have DKIM. And the spam rate is still 32%.
Authentication gets you through the front door. What happens after that depends on your sender reputation, your engagement rates, and your list quality.
If people aren’t opening your emails, inbox providers notice. Gmail specifically uses engagement-based filtering. If a contact hasn’t opened your emails in 90 days, Gmail starts routing your messages away from the inbox. Not just for that one contact. For everyone.
Your disengaged subscribers are actively hurting your deliverability to the people who do want to hear from you.
Gmail Changed the Rules in November 2025
Google made a significant shift in late 2025 that most small businesses missed entirely.
Before November 2025, Gmail would flag non-compliant bulk email with warnings. After November 2025, Gmail started outright rejecting those emails at the server level. They don’t land in spam. They don’t get filtered. They get bounced before they arrive.
If you send more than 5,000 emails per day to Gmail addresses without proper authentication, your emails may not just be filtered. They may never arrive at all.
For smaller senders, the threshold is less rigid. But the direction is clear. Gmail is getting stricter, not more lenient.
Australian Regulators Are Paying Attention Too
This isn’t just a technical problem. It’s becoming a legal one.
Australia’s communications regulator ACMA issued $5.49 million in penalties during 2025-2026, specifically for email and SMS marketing violations:
- Tabcorp: $4.1 million for sending thousands of messages without functional opt-outs or proper sender identification
- Betfair: $871,000 for sending 140+ marketing messages without consent
- PointsBet: $500,000 for marketing to people on self-exclusion registers
Those were gambling companies. But the regulations apply to every business sending commercial electronic messages in Australia. The Spam Act 2003 requires consent, sender identification, and a functional unsubscribe mechanism in every marketing email you send.
Only 14% of email senders globally include a proper List-Unsubscribe header. That’s a compliance gap hiding in plain sight.
What You Should Actually Check
If you’re sending marketing emails for your business, here are five things worth looking at this week.
1. Test your inbox placement, not just your delivery rate.
Use a tool like Unspam.email or Mail-Tester to send a test email and see where it actually lands across different providers. You might be surprised.
2. Check your authentication.
Ask your web developer or IT person whether SPF, DKIM, and DMARC are set up on your sending domain. If they don’t know what those are, that’s your answer.
3. Clean your list.
Remove contacts who haven’t opened an email in 90 days. Yes, your list will get smaller. Your results will get better. Those disengaged contacts are dragging down your deliverability for everyone else.
4. Check your unsubscribe process.
Every marketing email needs a visible, working unsubscribe link. If someone wants to leave, make it easy. The alternative is they mark you as spam, which is far worse for your reputation.
5. Look at your sending patterns.
Blasting 10,000 emails once a month then going silent creates suspicious patterns. Consistent, regular sends build a stronger sender reputation than sporadic bulk blasts.
The Only Metrics You Can Actually Trust
Deliverability is the first problem to solve. But even once your emails reach the inbox, you need to know what’s working.
Most businesses look at open rates. That number is becoming increasingly unreliable. Apple’s Mail Privacy Protection pre-loads tracking pixels, which means your “opens” include people who never actually read the email. Other email clients are following suit. Open rate is turning into a guess.
The two metrics you can still trust are click rate and replies. If someone clicked a link in your email, they read it. If someone replied, they engaged. Those numbers are real.
Hard bounces matter too. A hard bounce means the email address doesn’t exist. Every hard bounce you keep sending to damages your sender reputation. Remove them immediately after every send.
So the hierarchy looks like this:
- Fix deliverability first – make sure your emails reach the inbox
- Ignore open rates – they’re increasingly fictional
- Optimise for clicks and replies – the only engagement signals you can trust
- Track sales – the number that actually pays the bills
That business sending 16,000 emails? Even if their deliverability was perfect, click rate is what tells you whether the content was worth sending. A 0.7% click rate on emails that did reach the inbox still means the offer, the copy, or the audience wasn’t right.
Deliverability gets your email seen. Clicks tell you if it was worth seeing.
The Uncomfortable Maths
Back to that business with 16,000 emails and 12 sales.
At the global average spam rate of 32%, roughly 5,100 of those emails probably never reached an inbox. If a chunk of their list used Outlook or Yahoo, the number could be much higher.
They weren’t measuring email deliverability. They were measuring delivery rate. Two very different things.
The fix isn’t sending more emails. It’s making sure the emails you send actually get seen.
If your email marketing feels like it’s not working, it might be working exactly as well as it can. The problem might be that a third of your audience never sees what you send.
That’s worth checking before you blame the copy, the offer, or the subject line.
FAQ
What is a good email deliverability rate?
Industry benchmarks suggest 89-95% inbox placement is good, and above 95% is excellent. The global average sits around 65%, which means most senders have significant room for improvement. But deliverability is just the starting point. The real question is how many people clicked through and how many sales your emails generated. A 95% inbox placement rate with a 0.3% click rate still means your emails aren’t doing their job.
Why are my emails going to spam even with DMARC set up?
Authentication is necessary but not sufficient. DMARC proves you’re a legitimate sender, but inbox providers also evaluate your sender reputation, engagement rates, list quality, and content. If people aren’t opening your emails, providers interpret that as a signal your content isn’t wanted.
How often should I clean my email list?
Every 90 days at minimum. Remove hard bounces immediately after every send. Segment out contacts who haven’t engaged in 90 days and either run a re-engagement campaign or remove them. A smaller, engaged list will outperform a large, disengaged one every time.
What’s the difference between delivery rate and inbox placement rate?
Delivery rate measures emails that didn’t bounce. It tells you the email reached the mail server. Inbox placement rate measures emails that landed in the primary inbox, not spam or promotions tabs. You can have a 99% delivery rate and a 50% inbox placement rate. They measure completely different things.
Does email deliverability affect small businesses or just big senders?
It affects everyone. Gmail’s strictest requirements target senders of 5,000+ emails per day, but engagement-based filtering applies to all senders. If your contacts aren’t opening, your future emails get deprioritised regardless of list size. Small businesses with poor list hygiene can damage their sender reputation just as easily as large ones.