Opt-In

Email Marketing

Also: Email Opt-In · Subscribe · Double Opt-In

Opt-In Rate = Subscribers / Visitors × 100

TypeExplicit consent to receive emails

LegalRequired in Australia (Spam Act)

Benchmark1-3% website opt-in rate

Best practiceDouble opt-in for list health

Quick definition

The action a user takes to explicitly consent to receiving email communications. Australian law requires opt-in consent for commercial emails. Double opt-in adds a confirmation step, producing a higher-quality, more engaged list.

Where it shows up in the data

See Email benchmarks →

Single vs double opt-in

Single opt-in: user submits their email and is immediately added to the list. Double opt-in: user submits, then receives a confirmation email and must click a link to confirm. Double opt-in produces a smaller but more engaged and compliant list.

Opt-in vs opt-out

Opt-in means the user actively consents. Opt-out (pre-ticked boxes or automatic subscription) is not acceptable under the Australian Spam Act. Any marketing email list in Australia must be built on explicit opt-in consent.

Lead magnets and incentivised opt-ins

A lead magnet (free resource, discount, quiz, checklist) offered in exchange for an email address significantly increases opt-in rates. The value of the incentive and its relevance to the target audience determines how well it converts visitors to subscribers.

What it actually means

Opt-in refers to the deliberate action a user takes to consent to receiving marketing communications, most commonly by providing their email address through a sign-up form, lead magnet landing page or checkout process. In the context of Australian law (the Spam Act 2003), opt-in consent is required before sending any commercial electronic message. This means you cannot email people who gave you their business card, filled in a form for a non-marketing purpose or whose details you found online. They must have explicitly consented to receiving your marketing emails. Double opt-in adds a confirmation step after the initial sign-up, requiring users to click a confirmation link before being added to the active list. This produces a smaller list but one with higher deliverability rates and stronger engagement.

People don't subscribe to receive your emails. They subscribe to receive what you promised when they gave you their email address.

How to calculate it

Opt-In Rate = New Subscribers / Total Visitors × 100

Worked example. A website receives 5,000 visitors per month. 75 visitors submit the newsletter sign-up form. Opt-In Rate = 75 / 5,000 × 100 = 1.5%. This is within the typical range for a newsletter-only offer. A lead magnet might lift this to 3-5%.

The Australian context

The Australian Spam Act 2003 requires express or inferred consent for commercial electronic messages. Express consent is explicit opt-in. Inferred consent covers situations like an existing business relationship where the person provided contact details and it's reasonably expected they'd receive commercial messages. The Australian Communications and Media Authority (ACMA) enforces the Act with civil penalties. Australian businesses must maintain consent records in case of complaint.

Where people get this wrong

Using pre-ticked consent boxesPre-ticked or automatically enabled consent checkboxes don't constitute express opt-in consent under the Australian Spam Act. Each person must actively select to opt in.

Not tracking consent at the record levelIf someone complains about receiving unsolicited email, you must be able to demonstrate when and how they consented. Bulk lists with no individual consent records are legally exposed.

Conflating form submissions with email consentIf someone submits a contact form or books an appointment, that doesn't mean they've consented to marketing emails. Consent must be specific to the type of communication being sent.

Common questions

Is opt-in required for email marketing in Australia?

Yes. The Australian Spam Act 2003 requires explicit consent (opt-in) before sending commercial electronic messages. There is an inferred consent provision for existing business relationships, but express opt-in is the safest and clearest compliance position.

What is double opt-in and should I use it?

Double opt-in requires subscribers to confirm their sign-up via a link in a confirmation email. It reduces initial list size by 20 to 30 percent but produces a smaller, more engaged, more deliverable list. Recommended for businesses where email deliverability and engagement quality matter more than raw list size.

How do I increase my email opt-in rate?

The most reliable lever is a specific, high-value lead magnet: a guide, template, checklist or tool directly relevant to your target audience's problems. Generic 'subscribe for updates' forms convert at a fraction of the rate of specific value-exchange offers.

Keep exploring

About New Rebellion

New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.

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