(Visual Basic 6.0) Mailgun Send Simple Email

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Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://documentation.mailgun.com/en/latest/api-sending.html#sending

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim success As Long
success = 0

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

Dim http As New ChilkatHttp

' Implements the following CURL command:

' curl -s --user 'api:SENDING_API_KEY' 
' 	 https://api.mailgun.net/v3/YOUR_DOMAIN_NAME/messages 
' 	 -F from='Your Name <mailgun@YOUR_DOMAIN_NAME>' 
' 	 -F to='Joe Example <joe@example.com>' 
' 	 -F subject='Hello Joe Example' 
' 	 -F text='Congratulations Joe Example, you just sent an email with Mailgun!  You are truly awesome!'

' Use the following online tool to generate HTTP code from a CURL command
' Convert a cURL Command to HTTP Source Code

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

Dim req As New ChilkatHttpRequest
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 "text","Congratulations Joe Example, you just sent an email with Mailgun!  You are truly awesome!"

Dim resp As New ChilkatHttpResponse
success = http.HttpSReq("api.mailgun.net",443,1,req,resp)
If (success = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Dim sbResponseBody As New ChilkatStringBuilder
success = resp.GetBodySb(sbResponseBody)
Dim jResp As New ChilkatJsonObject
success = jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = 0

Debug.Print "Response Body:"
Debug.Print jResp.Emit()

Dim respStatusCode As Long
respStatusCode = resp.StatusCode
Debug.Print "Response Status Code = " & respStatusCode
If (respStatusCode >= 400) Then
    Debug.Print "Response Header:"
    Debug.Print resp.Header
    Debug.Print "Failed."
    Exit Sub
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

Dim id As String
id = jResp.StringOf("id")
Dim message As String
message = jResp.StringOf("message")