Sign/Encrypt Your Email: GPGTools on a Mac
You may not have realized this, but sending an email is not that different from sending a postcard---with the right know-how, anyone could intercept, read, or change it.
Signing an email with a digital signature means that the recipient can verify that no one has changed anything in the email in transit. Better still, encrypting an email means that no one can read it except the sender and you.
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