Lua

Check if a Received Email Was Decrypted

Demonstrates the read-only Chilkat Email.Decrypted property, which is true if the email arrived encrypted and was successfully decrypted. This property is only meaningful when ReceivedEncrypted is true, so you should always check ReceivedEncrypted first — a false value can mean either that the message was not encrypted or that decryption did not succeed. This example loads a received email and reports its encryption/decryption status.

Background: Encrypted email typically uses S/MIME. The sender encrypts the message with the recipient's public-key certificate, and only the holder of the matching private key can decrypt it. When Chilkat loads such a message and has access to the private key, it decrypts automatically; ReceivedEncrypted tells you the message arrived encrypted, and Decrypted tells you whether decryption succeeded.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Email.Decrypted property.
-- Decrypted is true if the email arrived encrypted and was successfully
-- decrypted.  It is only meaningful when ReceivedEncrypted is true.

local email = chilkat.Email.new()

-- Load an email that was received (from a .eml file).
local success = email:load_eml("qa_data/eml/received.eml")
if not success then
    print(email.last_error_text)
    return
end

-- Always check ReceivedEncrypted first.
if email.received_encrypted then
    if email.decrypted then
        print("The email was encrypted and was successfully decrypted.")
    else
        print("The email was encrypted but could NOT be decrypted.")
    end
else
    print("The email did not arrive encrypted.")
end