Java

Send MIME Bytes from a BinData via SMTP

Demonstrates the Chilkat MailMan.SendMimeBd method, which sends an email from caller-supplied MIME bytes held in a BinData. The arguments are the from address, the recipient list (the SMTP envelope recipients), and the BinData containing the MIME. This example loads a .eml file into a BinData and sends it.

Important: When sending caller-supplied MIME, ensure the Message-ID header is unique for each message. Sending MIME whose Message-ID was previously used can cause the message to be silently discarded as a duplicate by mail servers — see chilkatsoft.com/email_duplicate_message_id.asp.

Background: This is the binary counterpart to SendMime (which takes MIME as a string). Working from a BinData is the right choice when the message's raw bytes come straight from a file, a database blob, or a network stream — it delivers them byte-for-byte with no charset conversion that could alter the original, which matters because MIME can carry binary transfer encodings.

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import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the MailMan.SendMimeBd method, which sends an email from caller-supplied MIME
        // bytes held in a BinData.  The arguments are the from address, the recipient list (the SMTP
        // envelope recipients), and the BinData containing the MIME.

        MailMan mailman = new MailMan();

        // Configure the SMTP server connection.
        mailman.setSmtpHost("smtp.example.com");
        mailman.setSmtpPort(465);
        mailman.setSmtpSsl(true);
        mailman.setSmtpUsername("user@example.com");
        mailman.setSmtpPassword("myPassword");

        // Load the MIME bytes to send.  Here we read a .eml file, but the bytes could come from
        // any source.
        BinData bdMime = new BinData();
        try {
            bdMime.loadFile("qa_data/eml/message.eml");

            // IMPORTANT: When sending caller-supplied MIME, make sure the Message-ID header is unique
            // for each message.  Sending MIME that contains a Message-ID that was previously sent can
            // cause the message to be silently discarded as a duplicate by mail servers.  For details,
            // see: https://www.chilkatsoft.com/email_duplicate_message_id.asp

            // Send the MIME bytes to the envelope recipient(s).
            mailman.sendMimeBd("alice@example.com", "bob@example.com", bdMime);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("MIME email sent.");

        // Note: The path "qa_data/eml/message.eml" is a relative local filesystem path,
        // relative to the current working directory of the running application.

        // Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
        // connects and authenticates -- using the property settings above -- whenever a server
        // operation requires it.  Calling the explicit connect/authenticate methods can still be
        // helpful to determine whether a failure occurs while connecting or while authenticating.
    }
}