Show HN: Ephemeral, unsendable, and trackable emails – no downloads
sendpluto.com
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"unsendable" makes me think that the e-mail cannot be sent, rather than what the service actually offers -- e-mails that can be retrieved AFTER they are sent.
The idea of mutable e-mails scares me a lot, even if they're immutable after the receiver opens them.
Haha, maybe I should create an email client that just doesn't work. Then emails would certainly be unsendable.