C++

Attach an Email to Another Email

Demonstrates the Chilkat Email.AttachEmail method, which attaches a copy of another email to this email object. The attached email is encapsulated in a message/rfc822 subpart. Because a copy is attached, later changes to the source email do not affect the embedded message. This example attaches one email to another.

Background: "Forward as attachment" produces exactly this structure: the original message is embedded whole as a message/rfc822 part rather than quoted into the body. This preserves the original's headers and formatting intact, which matters for forwarding to a mailbox that will re-parse it, or for reporting spam/phishing with the original evidence attached. Such parts are counted by NumAttachedMessages.

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#include <CkEmail.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the AttachEmail method, which attaches a copy of another email to this email
    //  object.  The attached email is encapsulated in a message/rfc822 subpart.

    CkEmail innerEmail;
    innerEmail.put_Subject("Original message");
    innerEmail.put_From("alice@example.com");
    innerEmail.put_Body("This is the original message being forwarded.");

    CkEmail email;
    email.put_Subject("FW: Original message");
    email.put_From("bob@example.com");
    email.put_Body("See the attached original email.");

    //  Attach a copy of the inner email as a message/rfc822 part.

    success = email.AttachEmail(innerEmail);
    if (success == false) {
        std::cout << email.lastErrorText() << "\r\n";
        return true;
    }

    std::cout << "NumAttachedMessages = " << email.get_NumAttachedMessages() << "\r\n";
    }