Product
How InstantEduMail works
Four stages: create the address, accept the mail, render it safely, and decide whether the inbox expires or stays.
By the InstantEduMail Editorial Team · Published 14 August 2026 · Last reviewed 14 August 2026
- HTTPS everywhereSite and API served over TLS
- Owner-scoped accessRow-level security on every table
- Guest inboxes expireSigned-out inboxes last 2 hours
- Sandboxed HTML mailRendered in a restricted iframe
- Built for educationCoursework and QA workflows
- No card requiredCreate an inbox without payment
Create
A username plus an active domain becomes a live inbox immediately.
Receive
Inbound routing hands the message to our webhook, which parses and stores it.
Render
HTML is sanitised and sandboxed; plain text is linkified.
Keep or expire
Guest inboxes expire; signed-in inboxes stay until you delete them.
Creating the address
You pick a username and one of the active domains. The combination has to be unique, and once it is claimed the inbox exists — there is no provisioning delay to wait through and no confirmation step, because there is no account to confirm.
If you are signed in, the inbox is attached to your account. If you are not, it is attached to a guest session in your browser and carries an expiry.
Receiving a message
Mail addressed to our domains is accepted by our inbound routing and forwarded to a webhook on this application. The webhook verifies the request, normalises the recipient, rejects anything addressed to a domain we do not operate, then decodes the MIME structure into a body, an HTML alternative and any attachments.
The parsed message is stored against the matching inbox. If no inbox matches the recipient, the message is discarded rather than held.
Reading it safely
Plain-text bodies are linkified so that verification URLs remain clickable rather than arriving as inert text. HTML bodies are sanitised and then rendered inside a sandboxed frame, which keeps scripts and remote content in a message from touching the surrounding page. Attachments are stored separately and served only to the inbox owner.
The inbox updates live while it is open, so a message that arrives while you are watching appears without a refresh.
Expiry, or keeping the inbox
A guest inbox expires roughly two hours after creation, taking its messages with it. Creating a free account converts the inbox into a permanent one: the address stays yours, messages persist until you delete them, and sending becomes available alongside receiving.
Keep reading
- Temporary education email
What the inbox is for and what it cannot do.
- Temporary email privacy
Retention and the limits of a disposable address.
- Email testing for developers
Using the same pipeline to test your own product.
Frequently asked questions
Ready to try InstantEduMail?
Create a mailbox in seconds — no card required — or subscribe for monthly notes on education email.
Create a free inbox