Sunset Policy
Email MarketingAlso: Email Sunset Policy · List Sunset Rule
Quick definition
A sunset policy is a set of rules that removes or suppresses email subscribers who stop opening or clicking over a defined period. It protects sender reputation by keeping engagement rate high, rather than emailing a list full of inactive addresses.
How it varies across Australia
Australian sender volumes are generally smaller than the US or UK, which means internet service providers notice reputation problems from inactive segments sooner relative to overall list size. Businesses that skip a sunset policy tend to see deliverability soften gradually rather than fail all at once.
See retention and email benchmarks across Australian industries →What it actually means
Every email list has a graveyard. Subscribers who signed up years ago, opened a handful of emails, then went quiet. A sunset policy is the rule that decides when to stop emailing them.
The logic is straightforward. Internet service providers (ISPs) like Gmail and Outlook watch how recipients treat your email. If a large chunk of your list never opens anything, your engagement rate drops and ISPs start treating your other sends with suspicion too. One dead segment can drag down deliverability for your entire list.
A sunset policy usually works in stages. First, a re-engagement campaign tries to win back inactive subscribers with a direct ask or an incentive. If that fails, the subscriber moves to a reduced-frequency segment or gets suppressed from regular sends entirely. Some businesses go further and formally unsubscribe anyone who stays silent long enough.
This isn't about vanity. A smaller, more engaged list beats a bloated one every time it hits an inbox. Sender reputation is earned by consistent engagement, not list size. Segmentation by activity level is how you protect it before churn rate and spam complaints do the damage for you.
A sunset policy is not about giving up on subscribers. It's about refusing to let dead weight sink your entire list.
How it shows up
A sunset policy shows up as an automated workflow in your email service provider, not a single number. It usually triggers off a defined stretch of no opens and no clicks, moves the subscriber into a re-engagement campaign, then suppresses or unsubscribes them if that campaign gets no response. The exact trigger point differs by sender volume and industry, but the shape of the workflow is consistent: engaged, at-risk, re-engagement, sunset.
The Australian context
Australia's Spam Act 2003 requires consent for commercial email and a working unsubscribe mechanism, but it doesn't force you to remove inactive subscribers. The Australian Communications and Media Authority (ACMA) polices consent and complaints, not engagement thresholds. So a sunset policy in Australia is a deliverability decision, not a compliance one.
Australian sender volumes are smaller than the US or UK, which means ISPs notice reputation problems faster relative to your list size. A local business with a modest list carrying a large inactive segment can see deliverability issues sooner than a similarly styled business overseas with more volume to dilute the damage.
Where people get this wrong
Related terms
Common questions
What is a sunset policy in email marketing?
A sunset policy is a set of rules that removes or suppresses subscribers who stop opening or clicking your emails after a defined period. It protects your sender reputation by keeping your send list clean rather than emailing addresses that never respond.
How long should a sunset window be?
It depends on your typical send frequency and industry. Businesses emailing weekly usually flag inactivity sooner than businesses emailing monthly. The right window is the point where continued silence stops being normal for that subscriber's expected engagement pattern.
Will a sunset policy hurt my subscriber count?
Yes, and that's the point. Removing subscribers who never engage lowers your total count but raises your engagement rate, which is what internet service providers actually judge you on when deciding whether your email reaches the inbox.
Does a sunset policy replace a re-engagement campaign?
No. A re-engagement campaign should run first, giving inactive subscribers a genuine chance to come back before you suppress or remove them. The sunset policy is the fallback for subscribers who don't respond to that attempt.
Debrief
Get the next one
No spam. No fluff. Just the next article, straight to your inbox.
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.
How we think →