The Disposable Email Checker is a denylist lookup, not a mailbox probe. Open it when you need a fast “is this a known temp-mail host?” pass.
It belongs to Email List Quality alongside the Email Validator.
What gets checked
Paste one address or a list. Tokens split on new lines, commas, and semicolons — the same helper as the validator.
For each token the tool:
- Flags duplicates (case-insensitive).
- Flags invalid strings that are not a single
local@domain. - Takes the domain, lowercases it, and tests suffixes (
a.b.mailinator.com→mailinator.com). - If any suffix is on the denylist → Throwaway. Otherwise → Not listed.
“Not listed” copy in the table says it is not proof of a real inbox. That is the product.
What stays off the list
Privacy aliases — SimpleLogin, iCloud Hide My Email, Firefox Relay, Duck Addresses — are omitted. Blocking them confuses “I don’t want spam signups” with “I don’t allow people to hide their personal inbox.”
Role addresses (info@, admin@) and catch-alls are also out of v1. They need different rules.
When to use the other tools
- Broken syntax or
gmial.com→ Email Validator. - The same person twice → Dedupe before a campaign.
- What sending the cleaned list might cost → Email Cost Calculator.
Worked paths: Block throwaway signups and Clean throwaways from a list.