diff --git a/builtin/providers/template/resource_cloudinit_config.go b/builtin/providers/template/resource_cloudinit_config.go
index 88af9bef2..86798b8c7 100644
--- a/builtin/providers/template/resource_cloudinit_config.go
+++ b/builtin/providers/template/resource_cloudinit_config.go
@@ -170,6 +170,7 @@ func renderPartsToWriter(parts cloudInitParts, writer io.Writer) error {
 	}
 
 	writer.Write([]byte(fmt.Sprintf("Content-Type: multipart/mixed; boundary=\"%s\"\n", mimeWriter.Boundary())))
+	writer.Write([]byte("MIME-Version: 1.0\r\n"))
 
 	for _, part := range parts {
 		header := textproto.MIMEHeader{}
@@ -179,6 +180,9 @@ func renderPartsToWriter(parts cloudInitParts, writer io.Writer) error {
 			header.Set("Content-Type", part.ContentType)
 		}
 
+		header.Set("MIME-Version", "1.0")
+		header.Set("Content-Transfer-Encoding", "7bit")
+
 		if part.Filename != "" {
 			header.Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, part.Filename))
 		}