From f57aa7e340b6e726cdab6b5ff2767e1d6c7af57c Mon Sep 17 00:00:00 2001
From: Adam Stiskala <adam@readysell.com.au>
Date: Fri, 12 Jul 2019 12:16:02 +1000
Subject: [PATCH] Add support for sending in test mode

(cherry picked from commit 291b0b8d42f9c6d68a36e66d22351c534fd6ed13)
---
 src/Typesafe.Mailgun/FormPartsBuilder.cs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Typesafe.Mailgun/FormPartsBuilder.cs b/src/Typesafe.Mailgun/FormPartsBuilder.cs
index 12bf9cd..220ad3c 100644
--- a/src/Typesafe.Mailgun/FormPartsBuilder.cs
+++ b/src/Typesafe.Mailgun/FormPartsBuilder.cs
@@ -79,6 +79,15 @@ public static List<FormPart> Build(MailMessage message, IDictionary<string, IDic
 						result.Add(new SimpleFormPart("o:tag", tag));
 					}
 				}
+			}
+
+			if (message.Headers.AllKeys.Contains("X-Mailgun-Drop-Message"))
+			{
+				var dropMessage = message.Headers.GetValues("X-Mailgun-Drop-Message")?.FirstOrDefault();
+				if (dropMessage == "yes")
+				{
+					result.Add(new SimpleFormPart("o:testmode", "yes"));
+				}
 			}
 
 			result.AddRange(message.Attachments.Select(attachment => new AttachmentFormPart(attachment)));