Catto Mail Sign in

Email validation and tracked delivery

This server runs catto-mail. The client applications of this installation check addresses and send their email through it, and it handles bounces, complaints and suppressions for them.

Sign inAPI documentation

Operators and clients

Sign in to the dashboard with your email address: a single-use link arrives by email. There are no passwords.

There is no public sign-up. The administrator creates the accounts.

Sign in

Client applications

Applications submit validation and send jobs to the /v1 API with an API key, and learn the outcome of each message from signed webhooks or by asking the API.

API documentation

Received mail sent through this server?

It was sent for the organisation named as its sender, one of this installation's clients. To stop receiving its mail, use the unsubscribe link in the message, if it has one, or contact that sender.

Some messages link to a page here where you can say whether you still want mail from that sender, or ask never to receive mail through this service again.

To report unwanted mail, email the administrator at admin@cattomail.com.

When a sender turns tracking on, the links in a message and a small image point to this server. It records that the message was opened or a link was clicked, then sends you straight on to the link's address. It sets no cookies.

Many mail programs load images on their own, so a recorded open does not prove that anyone read the message.