diff --git a/core/server/api/canary/utils/validators/input/schemas/posts.json b/core/server/api/canary/utils/validators/input/schemas/posts.json
index 36bef7076c..3a7d187923 100644
--- a/core/server/api/canary/utils/validators/input/schemas/posts.json
+++ b/core/server/api/canary/utils/validators/input/schemas/posts.json
@@ -102,6 +102,10 @@
                     "type": ["string", "null"],
                     "maxLength": 500
                 },
+                "email_subject": {
+                    "type": ["string", "null"],
+                    "maxLength": 300
+                },
                 "custom_template": {
                     "type": ["string", "null"],
                     "maxLength": 100
diff --git a/core/server/data/schema/schema.js b/core/server/data/schema/schema.js
index a726595860..d9723bf742 100644
--- a/core/server/data/schema/schema.js
+++ b/core/server/data/schema/schema.js
@@ -62,7 +62,8 @@ module.exports = {
         twitter_title: {type: 'string', maxlength: 300, nullable: true},
         twitter_description: {type: 'string', maxlength: 500, nullable: true},
         meta_title: {type: 'string', maxlength: 2000, nullable: true, validations: {isLength: {max: 300}}},
-        meta_description: {type: 'string', maxlength: 2000, nullable: true, validations: {isLength: {max: 500}}}
+        meta_description: {type: 'string', maxlength: 2000, nullable: true, validations: {isLength: {max: 500}}},
+        email_subject: {type: 'string', maxlength: 300, nullable: true}
     },
     users: {
         id: {type: 'string', maxlength: 24, nullable: false, primary: true},