diff --git a/core/server/services/mega/post-email-serializer.js b/core/server/services/mega/post-email-serializer.js
index b65a26af63..0057e986f9 100644
--- a/core/server/services/mega/post-email-serializer.js
+++ b/core/server/services/mega/post-email-serializer.js
@@ -227,7 +227,7 @@ const serialize = async (postModel, options = {isBrowserPreview: false, apiVersi
     const momentDate = post.published_at ? moment(post.published_at) : moment();
     post.published_at = momentDate.tz(timezone).format('DD MMM YYYY');
 
-    post.authors = post.authors && post.authors.map(author => author.name).join(',');
+    post.authors = post.authors && post.authors.map(author => author.name).join(', ');
     if (post.posts_meta) {
         post.email_subject = post.posts_meta.email_subject;
     }