(Swift) IMAP STARTTLS (Explicit TLS/SSL)

The StartTls property is set to force the Connect method to automatically convert an connection to TLS/SSL via the STARTTLS IMAP command.

This is also known as "explicit TLS/SSL" as opposed to "implicit TLS/SSL". With implicit TLS/SSL, the IMAP client connects on the well-known IMAP TLS/SSL port 993 and the secure channel is immediately established. With explicit TLS/SSL, the IMAP client connects on the typical non-secure port (143 usually) and the converts the connection via the STARTTLS command.

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    var success: Bool = false

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let imap = CkoImap()!

    // Indicate that STARTTLS should be used to convert
    // to a secure TLS/SSL connection:
    imap.startTls = true
    imap.port = 143

    // Connect to an IMAP server and convert the connection
    // to TLS/SSL via STARTTLS.
    success = imap.connect("imap.example.com")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    // The remainder of this example is the same as for 
    // non-TLS/SSL...

    // Login
    success = imap.login("myLogin", password: "myPassword")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    // Select an IMAP mailbox
    success = imap.selectMailbox("Inbox")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    // Get the message IDs of all the emails in the mailbox
    var fetchUids: Bool = true
    let messageSet = CkoMessageSet()!
    success = imap.queryMbx("ALL", bUid: fetchUids, msgSet: messageSet)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    // Fetch the emails into a bundle object:
    let bundle = CkoEmailBundle()!
    var headersOnly: Bool = false
    success = imap.fetchMsgSet(headersOnly, msgSet: messageSet, bundle: bundle)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    // Loop over the bundle and display the FROM and SUBJECT of each.
    let email = CkoEmail()!
    var i: Int = 0
    var numEmails: Int = bundle.messageCount.intValue
    while i < numEmails {
        bundle.email(at: i, email: email)

        print("\(email.from!)")
        print("\(email.subject!)")
        print("--")
        i = i + 1
    }

    // Disconnect from the IMAP server.
    success = imap.disconnect()

}