You will be able to set up a list hygiene routine that removes bounces, unengaged contacts and risky addresses.
Every list decays. People change jobs and their work address stops existing. Students graduate and abandon their school email. Someone signs up for your checklist, reads it once, and never opens anything from you again. None of this is your fault, but if you keep sending to all of those addresses as if nothing has changed, the inbox providers you met in lesson 3.1 notice, and your mail to everyone else starts to suffer.
List hygiene is the routine that keeps decay from piling up. It is dull, regular work, a bit like clearing out the fridge, and it pays off quietly in better delivery for every send.
When an email cannot be delivered, the receiving server sends back a bounce. There are two kinds.
A hard bounce means the address does not exist or can never receive mail: a typo in the domain, a closed account, a company that shut down. Sending to it again achieves nothing, and repeated sends to dead addresses are one of the signals inbox providers use to spot careless senders. Remove hard bounces at once.
A soft bounce is temporary: a full mailbox, a server that was briefly down, a message too large. It may deliver next time. If the same address soft bounces again and again across several sends, treat it like a hard bounce.
The good news is that most email tools handle this automatically. They stop sending to hard bounces and suppress repeated soft bounces without being asked. Your job is to check that the setting is on, and to make sure you never re-import a suppressed address from an old spreadsheet.
Harder to handle are addresses that still work but belong to people who stopped paying attention. They do not bounce and they do not complain. They just never click, reply or buy, send after send, for months.
These quiet contacts drag your numbers down, and inbox providers see their silence. A large chunk of a list that ignores you looks a lot like a list of people who never wanted the mail.
Decide on a time window that suits how often you send. A business that emails weekly will see someone go quiet faster than one that emails monthly. Choose a window long enough that a person had several real chances to engage, then define "quiet" as no clicks or replies within it. Because of privacy features you will meet in lesson 8.1, opens are a poor guide here, so lean on clicks, replies and purchases.
Before removing quiet contacts, send them a re-permission email: a short message asking whether they still want to hear from you, with one clear button to stay. Priya's reads, in part: "You joined my list for the P5 heuristics checklist. If your child has moved on from upper primary, or you just get too much email, no hard feelings. Click below to keep getting my fortnightly maths tips. If I don't hear from you, I'll take you off the list this month." People who click stay. People who don't are removed or suppressed. Lesson 7.2 shows how to run this as an automatic flow later.
Some addresses exist only to catch senders with poor list practices. A spam trap is an address run by an inbox provider or an anti-spam organisation that never signs up for anything. Some are created for the purpose and published where scrapers will find them. Others are old addresses that were abandoned, left dead long enough to bounce, and then reactivated as traps.
Since a trap never subscribes, mail to one proves the sender got the address some other way: bought it, scraped it, or kept sending to a dead address for years. Hitting traps can hurt your reputation badly, and you will not see which address caused it.
Old lists and scraped lists are where traps live. That is why lesson 1.3 ruled out bought and scraped lists entirely, why double opt-in from lesson 2.3 helps, and why the routine above matters. A list built on consent and cleaned regularly has very little room for traps to get in.
It can feel painful to remove people. A list of 1,200 sounds better than a list of 800. But the 400 you remove were not reading, and they were quietly lowering the chance that the other 800 saw your email at all.
A smaller list with real engagement usually reaches the inbox more often than a large stale one. It is also cheaper, since most email tools price by the number of contacts, and its reports tell you something true.
Mei Ling's example routine fits on one page. Hard bounces: removed automatically by the tool, checked monthly. Complaints: suppressed automatically, and if more than a handful arrive after one send, she reviews what that email did differently. Quiet contacts: anyone with no clicks or orders in her chosen window gets the re-permission email each quarter, and non-responders are suppressed. Imports: nothing is added without a consent record.
In the activity below you will write your own one-page routine, stating how you handle bounces, complaints and contacts who have gone quiet, and the time window you have chosen for your business.
Write a one-page list hygiene routine stating how you will handle bounces, complaints, and contacts with no engagement in your chosen time window.
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