diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa005c6d0..abef15792 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 Notable changes to Mailpit will be documented in this file.
 
+## [v1.21.4]
+
+### Bugfix
+- Fix external CSS stylesheet loading in HTML preview ([#388](https://github.com/axllent/mailpit/issues/388))
+
+
 ## [v1.21.3]
 
 ### Chore
diff --git a/server/ui-src/components/message/Message.vue b/server/ui-src/components/message/Message.vue
index 6794f0ae3..a233c513c 100644
--- a/server/ui-src/components/message/Message.vue
+++ b/server/ui-src/components/message/Message.vue
@@ -78,8 +78,9 @@ export default {
 
 		// remove bad HTML, JavaScript, iframes etc
 		sanitizedHTML() {
+			// set target & rel on all links
 			DOMPurify.addHook('afterSanitizeAttributes', (node) => {
-				if (node.hasAttribute('href') && node.getAttribute('href').substring(0, 1) == '#') {
+				if (node.tagName != 'A' || (node.hasAttribute('href') && node.getAttribute('href').substring(0, 1) == '#')) {
 					return
 				}
 				if ('target' in node) {
@@ -115,7 +116,7 @@ export default {
 						'vertical-align',
 						'vlink',
 						'vspace',
-						'xml:lang'
+						'xml:lang',
 					],
 					FORBID_ATTR: ['script'],
 				}