From c5fef28ac9ff1c20c8a88135050e116aef641127 Mon Sep 17 00:00:00 2001
From: Julien Blatecky <julien.blatecky@creatiwity.net>
Date: Sun, 13 Sep 2020 11:03:51 +0200
Subject: [PATCH] Add Content-ID header for attachments

---
 src/lib.rs                    | 3 +++
 src/message/header/content.rs | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index c502caf..a054edf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -42,6 +42,9 @@ pub mod error;
 pub mod message;
 pub mod transport;
 
+#[macro_use]
+extern crate hyperx;
+
 use crate::error::Error;
 #[cfg(feature = "builder")]
 pub use crate::message::{
diff --git a/src/message/header/content.rs b/src/message/header/content.rs
index c48082e..f4c61fa 100644
--- a/src/message/header/content.rs
+++ b/src/message/header/content.rs
@@ -7,6 +7,8 @@ use std::{
     str::{from_utf8, FromStr},
 };
 
+header! { (ContentId, "Content-ID") => [String] }
+
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum ContentTransferEncoding {
     SevenBit,