With MailSlurp received emails are marked as when they are processed. Unread emails are bold in the user interface and can be fetched with the flag with many wait for methods. Sometimes you may want to control the read behavior manually - for this you can use the email controller method and pass a boolean:

Javascript example

You can use the API method with any framework. Here is an example using the Javascript client.

Dashboard control

You can also set email seen settings on the email page using the settings dropdown.