Spam traps are email addresses used by ISPs and anti-spam organizations to identify poor list hygiene. Even reputable senders can hit them, damaging sender reputation and deliverability.
This article explains what spam traps are, their types, and how to prevent them.
Before You Begin
Before addressing spam traps, ensure:
Double opt-in is enabled on all Signup Forms. Set Up Double Opt-In.
List cleaning runs quarterly. Clean Your Email List to Improve Deliverability.
You never purchase email lists. Purchased lists often contain spam traps.
What is a Spam Trap?
A spam trap is an email address created or repurposed by ISPs and anti-spam organizations to catch senders with poor list hygiene. These addresses:
Have never belonged to a real person (pristine traps).
Were abandoned and repurposed after a long inactivity period (recycled traps).
Contain common typos that are monitored (typo traps).
Sending to spam traps signals to ISPs that you didn't collect emails responsibly. This harms your sender reputation, reduces inbox placement, and may result in blacklisting.
Inactivity Periods Before Recycling
Different ISPs allow varying inactivity periods before converting an email into a recycled spam trap:
ISP | Inactivity Period Allowed |
Outlook.com | 270 days |
Gmail | 270 days |
Yahoo | 180 days (plus an extra 60 days for every year you've been a customer) |
AOL | 90 days |
Types of Spam Traps
Pristine Trap
Pristine spam traps are email addresses created by ISPs or anti-spam organizations. They have never been used by a real person.
Impact: Most harmful. Hitting a pristine trap can result in domain or IP blacklisting within 24–48 hours.
How they enter your list: Purchased lists, scraped data, or fake signups.
Recycled Trap
Recycled spam traps are legitimate email addresses that were abandoned for so long that the ISP repurposed them as traps.
Impact: Less severe than pristine traps but damages sender reputation over time.
How they enter your list: Sending to inactive Contacts who stopped engaging 6+ months ago.
Typo Trap
Typo traps are email addresses with common misspellings (e.g., "gnail.com" instead of "gmail.com" or "outlok.com" instead of "outlook.com").
Impact: Least harmful but signals poor list hygiene.
How they enter your list: Manual typos during signup or lack of email validation.
Where Do Filters Get Traps?
Spam traps originate from multiple sources:
ISPs monitor non-existent addresses for domains they own.
Blacklist organizations purchase domains to use as trap feeds.
Domain owners donate unused domains to anti-spam organizations.
How to Prevent Spam Traps
You cannot identify specific spam traps since ISPs keep this data private. However, you can remove likely spam traps by following these best practices.
Prevention Best Practices
Never buy email lists: Purchased lists violate anti-spam laws and are full of spam traps. Always collect Contacts through your own Signup Forms.
Enable double opt-in: Double opt-in requires subscribers to confirm their email address before being added to your list. This catches typos and fake emails. Set Up Double Opt-In in Omnisend.
Clean your list quarterly: Remove Contacts who haven't engaged with your emails in 6–12 months. Inactive Contacts often become recycled spam traps. Clean Your Email List to Improve Deliverability.
Implement a sunset policy: Automatically unsubscribe Contacts who haven't opened or clicked in 6–12 months. What Is an Email Sunset Policy?
How to Remove Spam Traps from Your List
If you suspect spam traps are already on your list, follow these steps:
Step 1. Create a segment for inactive Contacts
Go to Audience → Segments → Create Segment → Prebuilt Segments → Inactive Contacts.
Click Customize and adjust filters as needed (e.g., "Last opened: more than 90 days ago").
2. Select all inactive Contacts
Once the segment is saved, check the Name checkbox → Select all Contacts.
3. Unsubscribe inactive Contacts
Navigate to Actions → Unsubscribe.
This removes inactive contacts from your billing and prevents deliverability damage.
Spam Bots from Shopify
If spam bots or fake signups originate from Shopify, contact Shopify Support. These bots create accounts in your store or from the checkout page. Omnisend cannot control them. All Shopify-sourced Contacts will have a tag: "source: shopify".
💡 Tip: Enable Google reCAPTCHA on Shopify checkout pages to block bot signups.
FAQ
Can I identify which emails are spam traps?
No. ISPs and anti-spam organizations keep spam trap addresses private. You can only reduce the likelihood of hitting them by cleaning your list and using double opt-in.
What happens if I hit a spam trap?
Your sender reputation drops. Future emails may land in spam folders. Hitting a pristine trap can result in domain or IP blacklisting.
How often should I clean my list to avoid spam traps?
Clean your list every 3–6 months. Remove Contacts who haven't opened or clicked in 6–12 months.
Why am I still hitting spam traps after cleaning my list?
Spam traps can re-enter through new signups (typos, bots, fake emails). Always use double opt-in and monitor signup sources.
Looking for help? Contact our award-winning Support Team right in the app or email [email protected].