(Swift 3,4,5...) Auto-Generate or Explicitly Specify the Message-ID Email Header

Demonstrates how to auto-generate or explicitly specify the Message-ID header field.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    let email = CkoEmail()!
    var success: Bool

    email.subject = "test"
    email.body = "test"
    email.add(to: "Joe", emailAddress: "joe@example1.com")
    email.from = "mary@example2.com"

    let mailman = CkoMailMan()!

    // When the mailman sends email, it renders the email to be sent,
    // and then sends the rendered MIME.

    // Instead of actually sending the email, this example will render
    // to MIME so we can see what would be sent..

    // We can explicitly set the Message-ID like this:
    mailman.autoGenMessageId = false
    email.addHeaderField("Message-ID", fieldValue: "<xyz123@abc>")

    var mimeStr: String? = mailman.render(toMime: email)
    print("\(mimeStr!)")

    // This is what we get:

    // MIME-Version: 1.0
    // Date: Mon, 20 Jul 2020 17:20:09 -0500
    // Message-ID: <xyz123@abc>
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // X-Priority: 3 (Normal)
    // Subject: test
    // To: Joe <joe@example1.com>
    // From: mary@example2.com
    // 
    // test

    print("--------")

    // If we auto-generate...
    mailman.autoGenMessageId = true
    mimeStr = mailman.render(toMime: email)
    print("\(mimeStr!)")

    // We get this:

    // MIME-Version: 1.0
    // Date: Mon, 20 Jul 2020 17:21:20 -0500
    // Message-ID: <04EDE096BBFE484967F6398A973B0FCF6EA09A44@CHILKATSLICE>
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // X-Priority: 3 (Normal)
    // Subject: test
    // To: Joe <joe@example1.com>
    // From: mary@example2.com
    // 
    // test

}