Yes, and those recall messages only exist in the closed systems where such retraction is possible, or in the open systems which send those messages that are more designed for the closed systems.
The implementation I described with a slightly delayed send doesn’t use those recall messages, since the email being sent doesn’t actually get sent until after the delay. I believe this is how Gmail’s version of the feature works, for example.
The implementation I described with a slightly delayed send doesn’t use those recall messages, since the email being sent doesn’t actually get sent until after the delay. I believe this is how Gmail’s version of the feature works, for example.