(Objective-C) Auto-Generate or Explicitly Specify the Message-ID Email Header

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

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#import <CkoEmail.h>
#import <CkoMailMan.h>
#import <NSString.h>

CkoEmail *email = [[CkoEmail alloc] init];
BOOL success;

email.Subject = @"test";
email.Body = @"test";
[email AddTo: @"Joe" emailAddress: @"joe@example1.com"];
email.From = @"mary@example2.com";

CkoMailMan *mailman = [[CkoMailMan alloc] init];

// 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 = NO;
[email AddHeaderField: @"Message-ID" fieldValue: @"<xyz123@abc>"];

NSString *mimeStr = [mailman RenderToMime: email];
NSLog(@"%@",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

NSLog(@"%@",@"--------");

// If we auto-generate...
mailman.AutoGenMessageId = YES;
mimeStr = [mailman RenderToMime: email];
NSLog(@"%@",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