diff --git a/package-lock.json b/package-lock.json
index b2c8b6f4..9ae2f005 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -55,8 +55,8 @@
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-    "node_modules/@typescript-eslint/visitor-keys/node_modules/@typescript-eslint/types": {
-      "version": "8.17.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.17.0.tgz",
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-      "dev": true,
-      "license": "MIT",
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^16.0.0 || >=18.0.0"
       },
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
       }
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-    "node_modules/@typescript-eslint/visitor-keys/node_modules/eslint-visitor-keys": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.0.tgz",
-      "integrity": "sha512-UyLnSehNt62FFhSwjZlHmeokpRK59rcz29j+F1/aDgbkbRTk7wIc9XzdoasMUbRNKDM0qQt/+BJ4BrpFeABemw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
-      }
-    },
     "node_modules/@ungap/structured-clone": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/@ungap/structured-clone/-/structured-clone-1.2.0.tgz",
@@ -6701,9 +6521,9 @@
       "license": "MIT"
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-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.7.tgz",
-      "integrity": "sha512-Er2nc/H7RrMXZBFCEim6TCmMk02Z8vLC2Rbi1KEBggpo0fS6l0S1nnapwmIi3yW/+GOJap1Krg4w0Hg80oCqgQ==",
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.0.tgz",
+      "integrity": "sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==",
       "license": "MIT",
       "dependencies": {
         "ms": "^2.1.3"
@@ -7848,6 +7668,49 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/eslint-plugin-deprecation/node_modules/@typescript-eslint/types": {
+      "version": "7.18.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-7.18.0.tgz",
+      "integrity": "sha512-iZqi+Ds1y4EDYUtlOOC+aUmxnE9xS/yCigkjA7XpTKV6nCBd3Hp/PRGGmdwnfkV2ThMyYldP1wRpm/id99spTQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || >=20.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/eslint-plugin-deprecation/node_modules/@typescript-eslint/typescript-estree": {
+      "version": "7.18.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-7.18.0.tgz",
+      "integrity": "sha512-aP1v/BSPnnyhMHts8cf1qQ6Q1IFwwRvAQGRvBFkWlo3/lH29OXA3Pts+c10nxRxIBrDnoMqzhgdwVe5f2D6OzA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "@typescript-eslint/types": "7.18.0",
+        "@typescript-eslint/visitor-keys": "7.18.0",
+        "debug": "^4.3.4",
+        "globby": "^11.1.0",
+        "is-glob": "^4.0.3",
+        "minimatch": "^9.0.4",
+        "semver": "^7.6.0",
+        "ts-api-utils": "^1.3.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || >=20.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/eslint-plugin-deprecation/node_modules/@typescript-eslint/utils": {
       "version": "7.18.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-7.18.0.tgz",
@@ -7889,6 +7752,22 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/eslint-plugin-deprecation/node_modules/minimatch": {
+      "version": "9.0.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
+      "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/eslint-plugin-es": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/eslint-plugin-es/-/eslint-plugin-es-3.0.1.tgz",
@@ -9701,6 +9580,21 @@
       "dev": true,
       "license": "BSD-2-Clause"
     },
+    "node_modules/glob/node_modules/minimatch": {
+      "version": "9.0.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
+      "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/global-directory": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/global-directory/-/global-directory-4.0.1.tgz",
@@ -12495,6 +12389,24 @@
         "node": ">=18"
       }
     },
+    "node_modules/lint-staged/node_modules/debug": {
+      "version": "4.3.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.7.tgz",
+      "integrity": "sha512-Er2nc/H7RrMXZBFCEim6TCmMk02Z8vLC2Rbi1KEBggpo0fS6l0S1nnapwmIi3yW/+GOJap1Krg4w0Hg80oCqgQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/lint-staged/node_modules/execa": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/execa/-/execa-8.0.1.tgz",
@@ -13407,9 +13319,10 @@
       }
     },
     "node_modules/minimatch": {
-      "version": "9.0.5",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
-      "integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
+      "version": "9.0.3",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.3.tgz",
+      "integrity": "sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "brace-expansion": "^2.0.1"
@@ -13542,6 +13455,73 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/nconf": {
+      "version": "0.12.1",
+      "resolved": "https://registry.npmjs.org/nconf/-/nconf-0.12.1.tgz",
+      "integrity": "sha512-p2cfF+B3XXacQdswUYWZ0w6Vld0832A/tuqjLBu3H1sfUcby4N2oVbGhyuCkZv+t3iY3aiFEj7gZGqax9Q2c1w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "async": "^3.0.0",
+        "ini": "^2.0.0",
+        "secure-keys": "^1.0.0",
+        "yargs": "^16.1.1"
+      },
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/nconf/node_modules/cliui": {
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
+      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^7.0.0"
+      }
+    },
+    "node_modules/nconf/node_modules/ini": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-2.0.0.tgz",
+      "integrity": "sha512-7PnF4oN3CvZF23ADhA5wRaYEQpJ8qygSkbtTXWBeXWXmEVRXK+1ITciHWwHhsjv1TmW0MgacIv6hEi5pX5NQdA==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/nconf/node_modules/yargs": {
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
+      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/nconf/node_modules/yargs-parser": {
+      "version": "20.2.9",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.9.tgz",
+      "integrity": "sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/negotiator": {
       "version": "0.6.4",
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.4.tgz",
@@ -15209,6 +15189,13 @@
       "integrity": "sha512-6aU+Rwsezw7VR8/nyvKTx8QpWH9FrcYiXXlqC4z5d5XQBDRqtbfsRjnwGyqbi3gddNtWHuEk9OANUotL26qKUw==",
       "license": "BSD-3-Clause"
     },
+    "node_modules/secure-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/secure-keys/-/secure-keys-1.0.0.tgz",
+      "integrity": "sha512-nZi59hW3Sl5P3+wOO89eHBAAGwmCPd2aE1+dLZV5MO+ItQctIvAqihzaAXIQhvtH4KJPxM080HsnqltR2y8cWg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/semver": {
       "version": "7.6.3",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
@@ -17609,6 +17596,22 @@
         "node": ">= 14"
       }
     },
+    "node_modules/yaml-lint": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/yaml-lint/-/yaml-lint-1.7.0.tgz",
+      "integrity": "sha512-zeBC/kskKQo4zuoGQ+IYjw6C9a/YILr2SXoEZA9jM0COrSwvwVbfTiFegT8qYBSBgOwLMWGL8sY137tOmFXGnQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "consola": "^2.15.3",
+        "globby": "^11.1.0",
+        "js-yaml": "^4.1.0",
+        "nconf": "^0.12.0"
+      },
+      "bin": {
+        "yamllint": "dist/cli.js"
+      }
+    },
     "node_modules/yargs": {
       "version": "17.7.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
diff --git a/package.json b/package.json
index d0eedced..f0a55b5b 100644
--- a/package.json
+++ b/package.json
@@ -6,25 +6,36 @@
   "license": "MIT",
   "author": "UKEF",
   "scripts": {
+    "audit:fix": "npm audit --fix",
     "api-test": "jest --selectProjects=API",
     "build": "nest build -p tsconfig.build.json",
-    "housekeeping": "npm update --save --legacy-peer-deps && npm i --legacy-peer-deps && npm audit --fix && npm run spellcheck",
+    "housekeeping": "npm update --save --legacy-peer-deps && npm i --legacy-peer-deps && npm run type-check && npm run prettier:fix && npm run lint:fix && npm run validate:yml && npm run audit:fix && npm run spellcheck",
     "lint": "eslint . --ext .ts",
     "lint:fix": "eslint . --ext .ts --fix",
     "prettier": "prettier --no-error-on-unmatched-pattern --check **/*.{ts,js}",
+    "prettier:fix": "prettier --write **/*.{ts,js}",
+    "type-check": "tsc --noEmit --pretty",
     "spellcheck": "cspell lint --gitignore --no-must-find-files --unique --no-progress --show-suggestions --color '**/*'",
     "start": "nest start",
     "start:debug": "nest start --debug --watch",
     "start:dev": "nest start --tsc --watch",
     "start:prod": "node dist/src/main",
-    "unit-test": "jest --selectProjects=Unit"
+    "unit-test": "jest --selectProjects=Unit",
+    "validate:all": "npm run lint:fix && npm run prettier:fix && npm run type-check && npm run validate:yml",
+    "validate:yml": "npx yaml-lint **/*.yml --ignore=**/node_modules"
   },
   "lint-staged": {
     "**/package.json": "sort-package-json",
     "**/*.{js,ts}": [
-      "eslint --fix",
+      "lint:fix",
+      "prettier:fix"
+    ],
+    "**/*.md": [
       "prettier --write"
     ],
+    "**/*.yml": [
+      "npm run validate:yml"
+    ],
     "**/*": [
       "cspell lint --gitignore --no-must-find-files --unique --no-progress --show-suggestions --color"
     ]
@@ -76,8 +87,8 @@
     "@types/lodash": "^4.17.13",
     "@types/node": "^22.10.1",
     "@types/supertest": "^6.0.2",
-    "@typescript-eslint/eslint-plugin": "^8.17.0",
-    "@typescript-eslint/parser": "^7.18.0",
+    "@typescript-eslint/eslint-plugin": "^6.21.0",
+    "@typescript-eslint/parser": "^6.21.0",
     "chance": "^1.1.12",
     "cspell": "^8.16.1",
     "eslint": "^8.57.1",
@@ -109,7 +120,8 @@
     "supertest": "^7.0.0",
     "ts-jest": "29.2.5",
     "ts-loader": "^9.5.1",
-    "ts-node": "^10.9.2"
+    "ts-node": "^10.9.2",
+    "yaml-lint": "^1.7.0"
   },
   "engines": {
     "node": ">=21",
diff --git a/src/helper-modules/govuk-notify/dto/post-emails-response.dto.ts b/src/helper-modules/govuk-notify/dto/post-emails-response.dto.ts
index 1d1fb698..81ad77e9 100644
--- a/src/helper-modules/govuk-notify/dto/post-emails-response.dto.ts
+++ b/src/helper-modules/govuk-notify/dto/post-emails-response.dto.ts
@@ -24,6 +24,7 @@ export class PostEmailsResponseDataContent {
     example: null,
     description: 'Unsubscribe links are not used, so this field should always be null',
     nullable: true,
+    required: false,
   })
   public unsubscribe_link: string | null;
 }
@@ -68,6 +69,7 @@ export class PostEmailsResponseData {
     example: null,
     description: 'Email scheduling is not used, so this field should always be null',
     nullable: true,
+    required: false,
   })
   public scheduled_for: string | null;