Download the Full Version of a Partial Email

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Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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bool success = false;

//  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
//  header-only or partial Email and stores it in a second Email.  The full result includes
//  the complete body and any attachments.  The partial email must retain its UIDL.

Chilkat.MailMan mailman = new Chilkat.MailMan();

//  Configure the POP3 server connection.
mailman.MailHost = "pop.example.com";
mailman.MailPort = 995;
mailman.PopSsl = true;
mailman.PopUsername = "user@example.com";
mailman.PopPassword = "myPassword";

//  First fetch message 1 as headers only (a fast preview).  headerOnly=true.
Chilkat.Email partialEmail = new Chilkat.Email();

success = mailman.FetchOne(true,0,1,partialEmail);
if (success == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("Preview subject: " + partialEmail.Subject);

//  Now download the complete message (body and attachments).
Chilkat.Email fullEmail = new Chilkat.Email();
success = mailman.FetchFull(partialEmail,fullEmail);
if (success == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("Full email NumAttachments: " + Convert.ToString(fullEmail.NumAttachments));

//  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.