I'm having difficulty imagining any other way to do it.
Although the site also says it can also remove your attachments, so maybe the "email" itself is entirely hosted by unsend.it, which sends a link (probably a token) to the recipient on behalf of your account?
Ha, that would be something! "Dear Colleague, Please click this link to read something I just wrote in an email, so you can read it on a webpage (maybe, if I still feel like it)"
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I really hope it's more than just "your text is now hosted images instead!".
I'm having difficulty imagining any other way to do it.
Although the site also says it can also remove your attachments, so maybe the "email" itself is entirely hosted by unsend.it, which sends a link (probably a token) to the recipient on behalf of your account?
Ha, that would be something! "Dear Colleague, Please click this link to read something I just wrote in an email, so you can read it on a webpage (maybe, if I still feel like it)"
...and please enjoy this complementary tracking gif and bouquet of advertisements.