From 3a024a7c448cf773889795c2c34ba45dcef48acc Mon Sep 17 00:00:00 2001
From: Rodrigo Botelho <tato.rodrigo@gmail.com>
Date: Mon, 12 Dec 2022 11:49:07 -0300
Subject: [PATCH] Feat: Handle nested multipart/mixed

---
 parsemail.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/parsemail.go b/parsemail.go
index 3ea7495..de09ac4 100644
--- a/parsemail.go
+++ b/parsemail.go
@@ -271,6 +271,19 @@ func parseMultipartMixed(msg io.Reader, boundary string) (textBody, htmlBody str
 			}
 
 			htmlBody += strings.TrimSuffix(string(ppContent[:]), "\n")
+		} else if contentType == contentTypeMultipartMixed {
+			textBody2, htmlBody2, attachments2, embeddedFiles2, err := parseMultipartMixed(part, params["boundary"])
+			if err != nil {
+				return textBody, htmlBody, attachments, embeddedFiles, err
+			}
+			textBody += textBody2
+			htmlBody += htmlBody2
+			if attachments2 != nil {
+				attachments = append(attachments, attachments2...)
+			}
+			if embeddedFiles2 != nil {
+				embeddedFiles = append(embeddedFiles, embeddedFiles2...)
+			}
 		} else if isAttachment(part) {
 			at, err := decodeAttachment(part)
 			if err != nil {