fix(headers): Ensure that Content-type is the bottom header

nodemailer · Feb 29, 2024 · c7cf97e · c7cf97e
1 parent ade59e0
commit c7cf97e
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Showing 3 changed files with 658 additions and 608 deletions.
diff --git a/lib/mime-node/index.js b/lib/mime-node/index.js
@@ -497,6 +497,15 @@ class MimeNode {
             if (!this.getHeader('MIME-Version')) {
                 this.setHeader('MIME-Version', '1.0');
             }
+
+            // Ensure that Content-Type is the last header for the root node
+            for (let i = this._headers.length - 2; i >= 0; i--) {
+                let header = this._headers[i];
+                if (header.key === 'Content-Type') {
+                    this._headers.splice(i, 1);
+                    this._headers.push(header);
+                }
+            }
         }
 
         this._headers.forEach(header => {