CSV Email Validator
Validate the email column and keep the rest of the row.
Email Spam Trap Checker
Flag the addresses that look like traps before you send.
Drop a .csv or .txt list here, or click to choose
Quick Tool Overview
The Email Spam Trap Checker flags addresses with the shape of a trap — monitoring accounts, reserved and placeholder domains, unattended mailboxes and machine-generated local parts — and is clear about its limits.
- What it does
- Flags addresses that carry spam-trap patterns
- You give it
- The list you are about to send to
- You get back
- Flagged addresses with the reason for each
- Cannot detect
- Recycled traps — they look exactly like real addresses
- Best for
- A final check before sending to an unfamiliar list
About the Email Spam Trap Checker
A spam trap is an address that exists only to catch senders who did not get permission. Hitting one can move you onto a blocklist in a single send, and no honest tool can hand you a list of them — the whole point is that nobody publishes where they are.
What can be done is flagging the shapes traps take. Monitoring accounts like abuse@, postmaster@ and spam@ are checked, along with reserved and placeholder domains, unattended mailboxes, and local parts that look machine-generated rather than chosen by a person.
Just as importantly, the page is direct about the kind it cannot see: a recycled trap is an ordinary address that was abandoned and repurposed, and it looks exactly like a real one. The defence against those is not a checker but list hygiene, which is spelled out on the page.
Key features of the Email Spam Trap Checker
Pattern-based flagging
Monitoring accounts, placeholders and machine-looking mailboxes.
Honest about the limits
No tool can list real traps, and this page explains why.
Hygiene guidance included
What actually prevents recycled traps, since detection cannot.
Reason for every flag
So you can judge the call rather than accept it.
Runs offline
Your send list stays in the tab.
How to use the Email Spam Trap Checker
-
1
Paste the list
The addresses you are about to send to.
-
2
Review the flags
Each risky address is listed with the reason it was flagged.
-
3
Read the hygiene notes
What to do about the traps a checker cannot see.
-
4
Remove or re-permission
Drop the flagged addresses, or re-confirm them before sending.
Frequently asked questions
Not reliably, and be wary of one that says it can. Trap addresses are deliberately unpublished, and a recycled trap is indistinguishable from a normal address. What a tool can do is flag the patterns traps often take, which is what this does.
A real address that was abandoned, left to bounce for months, then reactivated by the provider purely to catch senders still mailing it. Nothing about the address looks wrong, which is the point — the only defence is removing addresses that stop engaging.
Depending on whose trap it is, anything from a quiet reputation hit to your sending IP or domain being listed at a major blocklist. Recovery takes weeks, so the caution is worth it.
Never buy or scrape a list, use confirmed opt-in, remove hard bounces immediately, and stop mailing anyone who has not opened anything in six to twelve months. Those four habits remove almost all of the exposure.
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