koinobori.social is a (free) microblogging service but over the mail. It does not require an account but it requires you to leave a house to drop it in the mailbox.
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"Frequently" asked questions
Why the mail?
Less spam and because mail is cool. You have to pay for a stamp and write (or type) things and put it in your mailbox, making the price to introduce lots of spam high.
Couldn't someone intercept it and read it?
Yes, so there is the (preferred) option to encrypt it in transit. It encrypts your text in the browser and generates a QR code that you print out. This gives us the benefit of not needing to transcribe your text and being able to process it on the same day.