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Email marketing is dead. Or is it? Every inbox is jammed with daily marketing emails, all fighting for the same sliver of attention.

And yet EDM emails still pull their weight. Why wouldn’t they? An EDM lands in front of an audience who actually chose to hear from you. They typed in their email address to join your list, or they handed over their hard-earned cash to become a customer. That is permission most marketing channels would kill for.

The numbers back it up. In 2026, email marketing returns an average of $36 to $42 for every $1 spent, which still makes it the highest-ROI channel in digital marketing. For comparison, paid search sits around $2 per dollar and paid social around $2.80. So if your EDM emails are not working, the system is not the problem. The way you are crafting them is. Here are the hacks that breathe life back into a flat email program.

Contents

What an EDM email actually is

EDM stands for electronic direct mail. It is a marketing message sent to a list of subscribers who have opted in to hear from you, usually to promote an offer, share content, or nurture a relationship over time. In Australia the term gets used more or less interchangeably with “email marketing”, though EDM tends to describe the designed, campaign-style send rather than a plain one-to-one note.

The thing that makes it so effective is permission. Unlike an ad someone scrolls straight past, an EDM goes to a person who put their hand up. You own that relationship outright. There is no algorithm deciding who sees it and no pay-to-play auction in the middle. That is rare, and it is exactly why email keeps outperforming flashier channels year after year. Here is how the levers stack up.

Lever What it does Quick win
Subject line Decides whether the email gets opened at all A/B test two versions on a small slice of your list
Segmentation Makes each email feel relevant, not generic Split your list by behaviour and tailor the message
The 80/20 mix Stops you training people to ignore you Keep sales emails to one in five sends
Deliverability Gets the email into the inbox in the first place Confirm SPF, DKIM and DMARC are set up
Mobile and CTA Turns the open into a click One clear button, easy to tap on a phone

Tweak your subject line

In an inbox overflowing with unread messages, your subject line is the whole ballgame. It is the one line that decides whether your email gets opened or buried. To add to the challenge, certain words trip spam filters, so the wrong choice can quietly land you in junk. Phrases like “click here”, “act now” and “lowest price” read as spammy, and our rundown of words to avoid in marketing covers plenty more worth steering around. Avoid spelling and grammar slips, skip the all caps and exclamation marks, and never add “RE:” to fake a reply. Emojis can draw the eye, but less is more. Personalisation lifts opens too, but only when you are completely certain the data is right. Nothing kills trust faster than “Hi [FIRST NAME]”.

When you are writing one, take a leaf out of Goldilocks’ book. Not too short, not too long, just right (around 28 to 39 characters tends to be the sweet spot). Every email client caps the characters it displays, and that limit shifts depending on whether someone is reading on a phone or a desktop. Anything too long simply gets cut off with an ellipsis anyway. Think short-ish and sweet.

The fastest way to learn what your list responds to is to A/B test. Take a small sample from your database, split it into two groups, send each a different subject line, and see which earns the higher open. Then send the winner to everyone else. Do it often enough and you build a real picture of what works for your audience rather than guessing in the dark.

One 2026 wrinkle worth knowing: AI-generated subject lines are now outperforming human-written ones by around 26% on open rates across a lot of programs, so it is worth pitting AI suggestions against your own and seeing what wins. Just keep a human eye on the tone so it still sounds like your brand. And take open rates with a grain of salt these days. Apple’s Mail Privacy Protection auto-loads tracking pixels, which inflates reported opens by several points, so clicks and conversions are the metrics that actually tell you the truth.

Segment your audience

Blasting the same sales email to your whole database, over and over, is the quickest way to train people to tune you out. Email marketing has become far more sophisticated, and your subscribers expect you to keep up. Whether you gather the information through tracking or by simply asking for it, the aim is to know enough about each subscriber to send them something that actually fits. It is the same thinking that sits under any good brand strategy: matchmaking your business to the right people rather than shouting at everyone at once.

How you segment will depend on what your business offers, but the common cuts are:

  • Behaviour: how they have engaged with your company
  • Demographic: their personal circumstances
  • Geographic: where they are located
  • Attitudinal: their interests and values

Then you tailor the message to suit the individual, based on what you know about them. It sounds like a mountain of work, but it does not have to be. Setting up a drip campaign (a series of automated emails that go out on a trigger without you lifting a finger) does the heavy lifting for you once it is built. And the payoff is real. Automated emails drive roughly 37% of all email sales while making up only about 2% of sends. Segmentation is where the money quietly hides.

Apply the 80/20 rule

Remember the story of the boy who cried wolf? He raised the alarm so many times that when the real wolf finally turned up, nobody believed him. Send too much of the same thing and your audience does exactly that to you. The problem is rarely that you send emails. It is how many of the same type you send, especially when every one is a sales pitch.

People do not necessarily want fewer emails (though that is not a licence to hound them). They want more variety. As a general guide, keep your sales emails to around 20% of what your audience receives from you. The other 80% should be a mix of the kinds of message that build the relationship rather than cash in on it. This is long-term brand building in miniature: trading a few short-term sales pushes for the kind of trust that keeps people buying for years.

Email type Roughly how much The job it does
Sales and promotional 20% Drives the offer and the direct revenue
Transactional Part of the 80% Order updates, confirmations, receipts
Nurture Part of the 80% Content that grows a connection with your brand
Engagement Part of the 80% Blogs or surveys where the goal is a click, not a sale

Get the balance right and people keep opening, because they have learned that your emails are worth their time. That is the whole game.

Get your emails delivered

Here is the hack nobody was talking about when this article first went up: none of the above matters if your email never reaches the inbox. Since February 2024, Gmail and Yahoo have enforced much stricter rules on anyone sending to their users, and Microsoft brought in similar requirements for Outlook in 2025. If you send in volume and you are not compliant, your emails get filtered to spam or rejected outright. From November 2025, Gmail tightened the screws further, moving from temporary delays to permanent rejections for senders who do not meet the mark.

In plain terms, here is what you now need in place:

  • Authentication. SPF, DKIM and DMARC records on your sending domain. These prove the email actually came from you, and they are now the price of entry rather than a nice-to-have.
  • One-click unsubscribe. Every marketing email needs an easy, one-click way out, honoured within a couple of days. Making people jump through hoops to leave only earns you spam complaints.
  • A low complaint rate. Keep spam complaints below 0.3%, and under 0.1% is the safe target. Send to people who never really wanted to hear from you and your sender reputation takes the hit.

Most decent email platforms handle the technical side of this, but it is worth confirming yours is set up properly rather than assuming. You can check the detail in Google’s email sender guidelines. A beautifully written EDM that lands in spam is just a tree falling in an empty forest.

Write for the thumb

Around two-thirds of emails are opened on a phone, so if your EDM is not easy to read and tap on a small screen, you are losing people before they ever reach your offer. Keep the layout to a single column, the text large enough to read without pinching and zooming, and the call to action a proper button rather than a tiny inline link that fat thumbs miss. The less friction between the open and the click, the better. That is the whole idea behind good design being invisible: people should glide to the action without noticing the design at all.

And give every email one job. A single, clear call to action, said plainly (“Get 20% off”, “Book your spot”, “Read the guide”), will always beat five competing links pulling the reader in different directions. Confusion does not convert. Clarity does.

Common EDM email mistakes

Most underperforming email programs are not failing for exotic reasons. They are tripping over the same handful of avoidable mistakes.

Mistake Why it hurts The fix
Sending the same sales email on repeat Trains your list to ignore you Apply the 80/20 mix and add variety
One message to the entire database Feels generic, so engagement drops Segment and tailor by behaviour and interest
Ignoring authentication and deliverability Great emails land in spam or bounce Set up SPF, DKIM and DMARC, and watch your complaint rate
Chasing open rates alone The metric is now inflated and unreliable Judge success on clicks and conversions
Designing for desktop first Most people read on a phone Build mobile-first with one clear CTA

Frequently asked questions

What does EDM stand for in email marketing?
EDM stands for electronic direct mail. It is a designed marketing email sent to a list of subscribers who have opted in to hear from you, used to promote offers, share content, or nurture a relationship. In Australia it is often used as another way of saying email marketing.

Are EDM emails still worth it in 2026?
Yes. Email still returns an average of $36 to $42 for every $1 spent, the highest ROI of any digital channel, well ahead of paid search and social. The reason is simple: you are reaching people who chose to hear from you, on a channel you own rather than rent.

How often should I send EDM emails?
There is no single magic number, and it depends on your audience and what you offer. The more useful rule is the mix, not the frequency. Keep sales emails to roughly one in five sends and fill the rest with content that builds the relationship, and people will tolerate (and even welcome) hearing from you more often.

What is the ideal subject line length for an EDM email?
Around 28 to 39 characters tends to perform best, mostly because email clients cut off anything longer with an ellipsis, especially on mobile. Aim for short, clear and specific, and A/B test to learn what your particular list responds to.

Why are my EDM emails going to spam?
Usually one of three things: your domain is not properly authenticated (no SPF, DKIM or DMARC), your spam complaint rate is too high, or your subject lines and content are tripping filters. Since 2024, Gmail and Yahoo reject or filter non-compliant senders far more aggressively, so authentication is the first place to look.

How do I measure whether my EDM emails are working?
Look past open rates, which are now inflated by privacy features that auto-load tracking pixels. Clicks, conversions and revenue per email tell you what is actually happening. Track those, test consistently, and measure your automated flows separately from your one-off campaigns.

Strong emails start with a strong brand

Every hack here helps, but your EDM emails are only ever as strong as the brand behind them. If the offer is landing yet the brand feels inconsistent from one email to the next, that is a positioning problem dressed up as an email problem. Sort the foundation and everything you send gets easier to write and easier to trust.

Want to know where yours stands? Take our free brand audit and find out in a few minutes.

Read more: What is a brand strategy and do I need one?