VBScript
Mailgun Send Send HTML Email with Attachments and HTML Images

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

VBScript
Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set http = CreateObject("Chilkat.Http")

http.Login = "api"
http.Password = "sending_api_key"'  Replace with your actual sending API key.

set req = CreateObject("Chilkat.HttpRequest")
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","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
set bd = CreateObject("Chilkat.BinData")
success = bd.LoadFile("qa_data/hamlet.zip")
If (success = 0) Then
    outFile.WriteLine("Failed to load file attachment.")
    WScript.Quit
End If

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

' add an image as CID
success = bd.LoadFile("qa_data/jpg/starfish.jpg")
If (success = 0) Then
    outFile.WriteLine("Failed to load HTML image.")
    WScript.Quit
End If

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

set resp = CreateObject("Chilkat.HttpResponse")
success = http.HttpSReq("api.mailgun.net",443,1,req,resp)
If (success = 0) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

set sbResponseBody = CreateObject("Chilkat.StringBuilder")
success = resp.GetBodySb(sbResponseBody)
set jResp = CreateObject("Chilkat.JsonObject")
success = jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = 0

outFile.WriteLine("Response Body:")
outFile.WriteLine(jResp.Emit())

respStatusCode = resp.StatusCode
outFile.WriteLine("Response Status Code = " & respStatusCode)
If (respStatusCode >= 400) Then
    outFile.WriteLine("Response Header:")
    outFile.WriteLine(resp.Header)
    outFile.WriteLine("Failed.")
    WScript.Quit
End If

' 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")

outFile.Close