publish delay (send delay in messaging systems) is a feature where new posts or messages are kept as drafts for a brief time before being published, allowing the user to cancel or edit them before they are published or sent.
Publish delay is a useful way to implement "Undo publish" or "Undo send" in messaging systems.
Such "undo" features help provide a more forgiving UI, which tends to be friendlier.
- Gmail calls it "Undo Send", with adjustable timeouts of 5-30 seconds before an e-mail is actually sent out.
- GMX's webmail interface has this feature.
- Hacker News calls it "timeout", a freely chosen number of seconds before posts become actually visible to other users.