List hygiene and cleaning

A healthy contact list = better deliverability, better engagement, and lower costs. This article covers what to watch for and what to do about it.

Why list hygiene matters

When you email people who don't open, don't click, mark you as spam, or have invalid addresses:

Deliverability suffers — inbox providers notice low engagement and route your future emails to spam
Costs go up — you're paying for contacts who don't read your emails
Your sender reputation drops — affects every email you send to everyone

A smaller, engaged list outperforms a larger, disengaged one — every time.

Categories of "unhealthy" contacts

Bounced emails:

Hard bounces — the email address is permanently invalid (mistyped, deleted account, domain doesn't exist). rasa.io automatically suppresses these.
Soft bounces — temporary issues (full inbox, server down). rasa.io retries these.

Unsubscribed contacts:

Clicked the unsubscribe link
Marked you as spam (auto-unsubscribes them)
Used a list-unsubscribe header

These are already removed from sends automatically.

Inactive subscribers:

Haven't opened or clicked in 3+, 6+, or 12+ months
Still receiving emails but never engaging
These are the trickiest because they're "technically" valid but hurt your reputation

Role-based emails:

info@, support@, admin@, sales@, etc.
Often unmanned or shared inboxes, lower engagement
Many spam filters flag senders who email these frequently

How rasa.io helps

rasa.io handles a lot automatically:

Hard bounces are suppressed after the first failure
Unsubscribes are honored immediately and globally
Spam complaints trigger automatic unsubscribe
Suspect Click filtering helps you understand which "engagement" is actually bot traffic from corporate scanners

For more on bot vs human engagement, see Suspect clicks.

What to do about inactive subscribers

Periodically (quarterly is a good cadence), review your inactive subscribers and decide:

Option 1: Re-engagement campaign

Send a "we miss you" email asking them to confirm they still want to receive your newsletter. Anyone who clicks stays. Anyone who doesn't, you remove.

Option 2: Direct removal

Just remove subscribers who haven't engaged in 12+ months. Faster, but you lose contacts who might have re-engaged later.

Option 3: Reduce frequency

For inactive subscribers, send less often (e.g., once a month instead of weekly). Lower engagement still helps, but the cost to deliverability is lower.

How to identify inactive subscribers

In Analytics, look at:

Active Subscribers report — see who's been opening and clicking
Daily Stats — see issue-by-issue performance
Individual contacts in Contacts → All Contacts show recent activity dates

Click any contact to see their last open and last click dates.

When to do a full list audit

Do a full hygiene pass:

After importing a new large list
Quarterly as a regular maintenance practice
After a major change in your sending strategy (e.g., switching newsletter focus)
If you see deliverability dropping (open rates falling, more spam complaints)

Quick checklist

☐ Review and remove role-based emails you don't actually want to email
☐ Look for and remove obvious typos in email addresses (e.g., gmail.con)
☐ Identify subscribers who haven't engaged in 6+ months
☐ Run a re-engagement campaign or remove them
☐ Check spam complaint rates in Analytics
☐ Confirm your unsubscribe and preference center pages are working

Best practices going forward

Validate emails at sign-up — many sign-up form tools (including rasa.io's) check for obviously invalid emails
Use double opt-in for new subscribers (sends a confirmation email before activating the subscription)
Set expectations upfront — tell new subscribers what they'll receive and how often
Make unsubscribing easy — don't bury the link or use dark patterns; clean unsubscribes are healthier than spam complaints

What's next

Subscribers vs contacts — understanding your audience numbers
Suspect clicks — how to read engagement data accurately
Subscriber permission and consent — staying compliant