Objective-C
Mailgun Send Send HTML Email with Attachments and HTML Images

Sends an HTML email with images and attachments.
Chilkat Objective-C Downloads

Objective-C
#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoBinData.h>
#import <CkoHttpResponse.h>
#import <CkoStringBuilder.h>
#import <CkoJsonObject.h>
#import <NSString.h>

BOOL success = NO;

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

CkoHttp *http = [[CkoHttp alloc] init];

http.Login = @"api";
http.Password = @"sending_api_key";//  Replace with your actual sending API key.

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
req.HttpVerb = @"POST";
req.Path = @"/v3/YOUR_DOMAIN_NAME/messages";
req.ContentType = @"multipart/form-data";

// Change YOUR_DOMAIN_NAME to something like "mg.your-domain.com".
[req AddParam: @"from" value: @"Your Name <mailgun@YOUR_DOMAIN_NAME>"];
[req AddParam: @"to" value: @"Joe Example <joe@example.com>"];
[req AddParam: @"subject" value: @"Hello Joe Example"];
[req AddParam: @"html" value: @"<html><body><b>This is the HTML body</b><br><img src=\"cid:cidStarfish.jpg\"></body></html>"];

// An a attachd file
CkoBinData *bd = [[CkoBinData alloc] init];
success = [bd LoadFile: @"qa_data/hamlet.zip"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load file attachment.");
    return;
}

[req AddBdForUpload: @"attachment" remoteFilename: @"hamlet.zip" byteData: bd contentType: @"application/zip"];

// add an image as CID
success = [bd LoadFile: @"qa_data/jpg/starfish.jpg"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load HTML image.");
    return;
}

[req AddBdForUpload: @"inline" remoteFilename: @"cidStarfish.jpg" byteData: bd contentType: @"image/jpeg"];

CkoHttpResponse *resp = [[CkoHttpResponse alloc] init];
success = [http HttpSReq: @"api.mailgun.net" port: [NSNumber numberWithInt: 443] ssl: YES request: req response: resp];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
[resp GetBodySb: sbResponseBody];
CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[jResp LoadSb: sbResponseBody];
jResp.EmitCompact = NO;

NSLog(@"%@",@"Response Body:");
NSLog(@"%@",[jResp Emit]);

int respStatusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",resp.Header);
    NSLog(@"%@",@"Failed.");
    return;
}

// Sample JSON response:
// (Sample code for parsing the JSON response is shown below)

// {
//   "id": "<20210429234809.1.2D550E1C94D3D98F@sandbox0e542e4c577f4bbb98c8bf6b6bca727b.mailgun.org>",
//   "message": "Queued. Thank you."
// }

// Sample code for parsing the JSON response...
// Use the following online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON

NSString *id = [jResp StringOf: @"id"];
NSString *message = [jResp StringOf: @"message"];