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Are there any sites from which I can send a message that is being self destructed(self deleted) once read?
It could be any kind of message: e-mail, SMS etc.
Bellow is a clearnet link to cryptonbin. Just set the expiration time 'burn after reading' you can also encrypt it with a passphrase that you need to share with the recipient.
Good luck! Cheers!
Sonar is a Hidden Service that would suit your purpose. I recommend encrypting communications yourself using PGP before entering them in the site. Zero Trust.