VouchleyDisposable email database
Is 33mail.com a disposable email?
Quick answer
33mail.com is operated by 33mail, a disposable / temporary email service. Signups using this domain are almost always throwaway. Block at signup if your product depends on long-term email reachability.
About 33mail
33mail is a long-running email-aliasing service: users get unlimited addresses of the form anything@username.33mail.com, all forwarding to their real inbox, with per-alias blocking when one starts attracting spam. It's alias infrastructure rather than a throwaway inbox.
What it’s typically used for
Privacy-conscious users creating a unique address per service so they can trace and cut off whoever leaks or sells their email.
Should you block 33mail.com in your signup form?
More nuanced than pure throwaways — mail genuinely reaches a real person who wants it. Risk-tier rather than hard-block, and note the format: matching requires wildcarding *.33mail.com, since every user has their own subdomain.
How to detect 33mail.com in code
You don’t need to maintain a hand-rolled list. Vouchley returns a disposable flag (and the rest of the signup score) on every check:
curl -X POST https://api.vouchley.getrevlio.com/v1/verify \
-H "Authorization: Bearer vch_live_..." \
-H "Content-Type: application/json" \
-d '{
"email": "anyone@33mail.com",
"ip_address": "203.0.113.10"
}'
# Response:
# {
# "score": 12,
# "recommendation": "block",
# "email": { "disposable": true, "valid": true },
# ...
# }Block disposable signups in one API call.
Vouchley keeps the disposable list current — including alias domains and new providers — so you never have to maintain it yourself.