Contacts engage with your business in many ways — calls, texts, website visits, purchases, and more. Email is just one channel, and not everyone prefers it. The goal is to send marketing emails only to people who find them valuable, while managing others in ways that fit how they prefer to engage.
Keeping your list clean improves your deliverability and ensures your emails reach the inboxes of those who truly want them. Two factors matter most:
List Hygiene — keeping your list clean and engaged
Sender Reputation — how mailbox providers like Google, Microsoft, and Yahoo view your sending practices
Why List Hygiene and Sender Reputation Matter
Poor list hygiene and a damaged sender reputation do not just hurt one campaign — they can affect every email you send going forward. Mailbox providers track your sending behavior over time. A clean list, engaged subscribers, and responsible sending habits are what keep your emails out of the spam folder and in front of the clients who want to hear from you.
What Is List Hygiene?
List hygiene is the ongoing practice of maintaining your contact list so that:
Email addresses are valid and active
Contacts are engaged with your content
Unengaged or invalid addresses are removed before they harm your reputation
Regularly cleaning your list reduces the risk of:
List Hygiene Best Practices
Collect good data — Carefully enter and confirm email addresses. For example, confirm whether an address is flyinghigh@keap.com or flying.hi@keap.com before adding it to your list.
Use double opt-in — Require new subscribers to confirm via email before being added. This ensures the address is valid and that the contact genuinely wants your content.
Avoid purchased lists — They often contain invalid addresses and spam traps that can quickly damage your sender reputation.
Send re-engagement campaigns — For contacts who have not engaged in 3–6 months, send a campaign asking them to confirm they still want your emails.
Remove or opt-out unengaged contacts — If someone has not engaged in 6+ months, removing them is better than risking deliverability issues.
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Hard bounces (address does not exist): remove immediately.
Soft bounces (temporary issues): suppress after 3–5 bounces.
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Use Keap™'s Automated List Management (Classic Apps only) — Automatically marks contacts as:
Unengaged Marketable (after approximately 3–4 months): still eligible for email sends but considered inactive.
Unengaged Non-Marketable (based on the time frame you set — 6 months is recommended): no longer eligible for marketing emails until the contact re-engages.
Segment your list — Use tags to group contacts by interest and send targeted campaigns rather than sending the same content to everyone.
Sender Reputation
Your sender reputation is how mailbox providers judge whether your emails are trustworthy and inbox-worthy. It is influenced by three main factors.
Your Content
Avoid spam-like subject lines and language
Maintain a healthy image-to-text ratio — approximately 20% images and 80% text
Be mindful of links — do not include domains with poor reputations
Your Email Service Provider (ESP)
An ESP — like Keap™, Mailchimp, or Emma — is the engine behind your email sends, not Gmail or Outlook. Your ESP's practices directly impact your deliverability. Keap™ supports your deliverability by:
Vetting customer lists and monitoring sending behavior
Authenticating email for legitimacy using SPF, DKIM, and DMARC
Managing bounces
Monitoring IP reputation
Maintaining a dedicated compliance team
Your Sender Domain
Your sending domain — everything after the "@" in your email address — has its own reputation. Problems like spam complaints, spam trap hits, or consistently sending to unengaged recipients can damage your domain reputation even if you switch ESPs.
Regular List Cleanup
If you already clean regularly: continue every few months by sending re-engagement campaigns, tagging unengaged contacts, and removing those who remain inactive.
If you have not cleaned in a long time: do not try to re-engage very old or inactive contacts. Instead, find and tag them, then remove them from your marketing lists.
Key Takeaway
Healthy list hygiene ensures you are only sending to people who actually want your emails. This improves engagement, strengthens your sender reputation, and keeps your emails in the inbox — right where they belong.
Looking for Extra Help?
If you would like professional guidance with your email practices or tools to improve your deliverability, check out these trusted partners:
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Email Deliverability — Specialist Training, Consulting, and Software
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List Cleaning
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Form Security
Frequently Asked Questions
What does this article cover?
This article covers email list hygiene and sender reputation for Keap™ users, including what list hygiene is, best practices for keeping your list clean, how sender reputation is built and damaged, how to approach regular list cleanup, and trusted third-party tools for deliverability support. It does not cover technical email authentication setup or Keap™ account configuration.
How often should I clean my email list?
Clean your list every few months. Send re-engagement campaigns to contacts who have not engaged in 3–6 months, and remove or opt-out contacts who have not engaged in 6 or more months. If your list has not been cleaned in a long time, do not attempt to re-engage old contacts — remove them directly instead.
What is the difference between a hard bounce and a soft bounce?
A hard bounce means the email address does not exist and should be removed from your list immediately. A soft bounce is a temporary delivery failure — suppress the contact after 3–5 soft bounces. For a full explanation, see Email Bounces Explained with Keap.
What does Keap's Automated List Management do?
Keap™'s Automated List Management (Classic Apps only) automatically marks contacts as Unengaged Marketable after approximately 3–4 months of inactivity — they can still receive emails but are considered inactive. After the time frame you set (6 months is recommended), contacts are marked Unengaged Non-Marketable and are no longer eligible for marketing emails until they re-engage. See Automated List Management with Keap for full details.
Can a damaged sender domain reputation be fixed by switching ESPs?
No. Your sending domain has its own reputation that follows you regardless of which ESP you use. Spam complaints, spam trap hits, and consistently sending to unengaged recipients all damage your domain reputation — and that damage persists even if you move to a different email platform.
What is double opt-in and why should I use it?
Double opt-in requires new subscribers to confirm their email address by selecting a link in a confirmation email before they are added to your list. This ensures the address is valid, reduces the risk of spam traps, and confirms the contact genuinely wants to receive your emails — all of which protect your sender reputation.
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