Mailgun Send Send HTML Email with Attachments and HTML Images

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

    success := false

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

    http := chilkat.NewHttp()

    http.SetLogin("api")
    http.SetPassword("sending_api_key")    //  Replace with your actual sending API key.

    req := chilkat.NewHttpRequest()
    req.SetHttpVerb("POST")
    req.SetPath("/v3/YOUR_DOMAIN_NAME/messages")
    req.SetContentType("multipart/form-data")

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

    // An a attachd file
    bd := chilkat.NewBinData()
    success = bd.LoadFile("qa_data/hamlet.zip")
    if success == false {
        fmt.Println("Failed to load file attachment.")
        http.DisposeHttp()
        req.DisposeHttpRequest()
        bd.DisposeBinData()
        return
    }

    req.AddBdForUpload("attachment","hamlet.zip",bd,"application/zip")

    // add an image as CID
    success = bd.LoadFile("qa_data/jpg/starfish.jpg")
    if success == false {
        fmt.Println("Failed to load HTML image.")
        http.DisposeHttp()
        req.DisposeHttpRequest()
        bd.DisposeBinData()
        return
    }

    req.AddBdForUpload("inline","cidStarfish.jpg",bd,"image/jpeg")

    resp := chilkat.NewHttpResponse()
    success = http.HttpSReq("api.mailgun.net",443,true,req,resp)
    if success == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        req.DisposeHttpRequest()
        bd.DisposeBinData()
        resp.DisposeHttpResponse()
        return
    }

    sbResponseBody := chilkat.NewStringBuilder()
    resp.GetBodySb(sbResponseBody)
    jResp := chilkat.NewJsonObject()
    jResp.LoadSb(sbResponseBody)
    jResp.SetEmitCompact(false)

    fmt.Println("Response Body:")
    fmt.Println(*jResp.Emit())

    respStatusCode := resp.StatusCode()
    fmt.Println("Response Status Code = ", respStatusCode)
    if respStatusCode >= 400 {
        fmt.Println("Response Header:")
        fmt.Println(resp.Header())
        fmt.Println("Failed.")
        http.DisposeHttp()
        req.DisposeHttpRequest()
        bd.DisposeBinData()
        resp.DisposeHttpResponse()
        sbResponseBody.DisposeStringBuilder()
        jResp.DisposeJsonObject()
        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

    id := jResp.StringOf("id")
    message := jResp.StringOf("message")

    http.DisposeHttp()
    req.DisposeHttpRequest()
    bd.DisposeBinData()
    resp.DisposeHttpResponse()
    sbResponseBody.DisposeStringBuilder()
    jResp.DisposeJsonObject()