Swift
Mailgun Send Send HTML Email with Attachments and HTML Images

Sends an HTML email with images and attachments.
Chilkat Swift Downloads

Swift

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 http = CkoHttp()!

    http.login = "api"
    http.password = "sending_api_key"    //  Replace with your actual sending API key.

    let req = CkoHttpRequest()!
    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(name: "from", value: "Your Name <mailgun@YOUR_DOMAIN_NAME>")
    req.addParam(name: "to", value: "Joe Example <joe@example.com>")
    req.addParam(name: "subject", value: "Hello Joe Example")
    req.addParam(name: "html", value: "<html><body><b>This is the HTML body</b><br><img src=\"cid:cidStarfish.jpg\"></body></html>")

    // An a attachd file
    let bd = CkoBinData()!
    success = bd.loadFile(path: "qa_data/hamlet.zip")
    if success == false {
        print("Failed to load file attachment.")
        return
    }

    req.addBd(forUpload: "attachment", remoteFilename: "hamlet.zip", byteData: bd, contentType: "application/zip")

    // add an image as CID
    success = bd.loadFile(path: "qa_data/jpg/starfish.jpg")
    if success == false {
        print("Failed to load HTML image.")
        return
    }

    req.addBd(forUpload: "inline", remoteFilename: "cidStarfish.jpg", byteData: bd, contentType: "image/jpeg")

    let resp = CkoHttpResponse()!
    success = http.httpSReq(domain: "api.mailgun.net", port: 443, ssl: true, request: req, response: resp)
    if success == false {
        print("\(http.lastErrorText!)")
        return
    }

    let sbResponseBody = CkoStringBuilder()!
    resp.getBodySb(sb: sbResponseBody)
    let jResp = CkoJsonObject()!
    jResp.loadSb(sb: sbResponseBody)
    jResp.emitCompact = false

    print("Response Body:")
    print("\(jResp.emit()!)")

    var respStatusCode: Int = resp.statusCode.intValue
    print("Response Status Code = \(respStatusCode)")
    if respStatusCode >= 400 {
        print("Response Header:")
        print("\(resp.header!)")
        print("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

    var id: String? = jResp.string(of: "id")
    var message: String? = jResp.string(of: "message")

}