diff --git a/app.js b/app.js
index 5c128bb..a744a97 100644
--- a/app.js
+++ b/app.js
@@ -12,6 +12,7 @@ const app         = express();
 
 // Middleware
 const compression = require('compression')
+const rateLimit   = require('express-rate-limit')
 const authenticate= require('./src/middlewares/auth.middlewares')
 
 // Internal Requires
@@ -29,6 +30,13 @@ const regRtr   = require('./src/routes/registration.routes');       // /auth end
 const srvListen = process.env.OWL_SRV_LISTEN || "0.0.0.0"
 const srvPort   = process.env.OWL_SRV_PORT || 8460
 
+const limiter = rateLimit({
+	windowMs: 15 * (60 * 1000), // 15 minutes
+	max: 100, // Limit each IP to 100 requests per `window` (here, per 15 minutes)
+	standardHeaders: true, // Return rate limit info in the `RateLimit-*` headers
+	legacyHeaders: true, // Disable the `X-RateLimit-*` headers
+})
+
 // Print version number:
 log.out(`app: Starting OwlBoard - Backend Version: ${version.app} - API versions: ${version.api}`, "init");
 
@@ -52,6 +60,7 @@ app.use((err, req, res, next) => {
 // Global Middleware:
 app.use(express.json()); //JSON Parsing for POST Requests
 app.use(compression()) // Compress API Data if supported by client
+app.use(limiter)
 
 // Unauthenticated Routes
 app.use('/api/v1/list', listRtr);
diff --git a/package-lock.json b/package-lock.json
index 37d5ef9..47f9a94 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "axios": "^1.2.1",
         "compression": "^1.7.4",
         "express": "^4.18.2",
+        "express-rate-limit": "^6.7.0",
         "ldbs-json": "^1.2.1",
         "mongodb": "^4.13.0",
         "nodemailer": "^6.9.1",
@@ -1426,6 +1427,17 @@
         "node": ">= 0.10.0"
       }
     },
+    "node_modules/express-rate-limit": {
+      "version": "6.7.0",
+      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-6.7.0.tgz",
+      "integrity": "sha512-vhwIdRoqcYB/72TK3tRZI+0ttS8Ytrk24GfmsxDXK9o9IhHNO5bXRiXQSExPQ4GbaE5tvIS7j1SGrxsuWs+sGA==",
+      "engines": {
+        "node": ">= 12.9.0"
+      },
+      "peerDependencies": {
+        "express": "^4 || ^5"
+      }
+    },
     "node_modules/express/node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
diff --git a/package.json b/package.json
index fb6934b..0d4e876 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
     "axios": "^1.2.1",
     "compression": "^1.7.4",
     "express": "^4.18.2",
+    "express-rate-limit": "^6.7.0",
     "ldbs-json": "^1.2.1",
     "mongodb": "^4.13.0",
     "nodemailer": "^6.9.1",
diff --git a/src/middlewares/auth.middlewares.js b/src/middlewares/auth.middlewares.js
index c740895..a97d0b0 100644
--- a/src/middlewares/auth.middlewares.js
+++ b/src/middlewares/auth.middlewares.js
@@ -11,7 +11,7 @@ module.exports = async function authCheck(req, res, next) {
         return next(err)
     }
     try {
-        var result = await utils.isAuthed(uuid) | false
+        var result = await utils.isAuthed(uuid) || false
         if (!result) {
             const err = new Error("Unauthorised");
             err.status = 401
diff --git a/src/services/mail.services.js b/src/services/mail.services.js
index e3fa3f6..0f30f3a 100644
--- a/src/services/mail.services.js
+++ b/src/services/mail.services.js
@@ -23,7 +23,7 @@ async function send(message){ // message is an object containing strings for: *t
   try {
     var res = await transporter.sendMail(message)
   } catch(err) {
-    log.out(`mailServices.send: Message send failed`, "err")
+    log.out(`mailServices.send: Message send failed: ${err}`, "err")
     return false;
   }
   log.out(`mailServices.send: SMTP Response: ${res.response}`)
diff --git a/src/services/registration.services.js b/src/services/registration.services.js
index 2e3813f..b47e301 100644
--- a/src/services/registration.services.js
+++ b/src/services/registration.services.js
@@ -5,17 +5,16 @@ const mail    = require('./mail.services')
 const clean   = require('../utils/sanitizer.utils')
 const domains = require('../configs/domains.configs')
 
-async function createRegKey(body){
+async function createRegKey(body) {
     log.out(`registerServices.createRegKey: Incoming request`, "INFO")
-    log.out(`registerServices.createRegKey: ${JSON.stringify(domains)}`)
-    const domain = await clean.splitDomain(body.email)
+    const domain = await clean.getDomainFromEmail(body.email) // The function should validate the email
     log.out(`registerServices: New registration request from domain: ${domain}`, "info")
-    if (domains.includes(domain)) { // Needs testing
+    if (domains.includes(domain)) {
       log.out(`registerServices.createRegKey: Key from valid domain: ${domain}`)
-      const uuid = auth.generateKey();
-      db.addRegReq(await uuid, domain)
-      const message = auth.generateConfirmationEmail(body.email, uuid)
-      if (await message == false) { // This error should be handled in the upstream function
+      const uuid = await auth.generateKey();
+      db.addRegReq(uuid, domain)
+      const message = await auth.generateConfirmationEmail(body.email, uuid)
+      if (!message) {
         const err = new Error("Message generation error");
         log.out(`registerServices.createRegKey: Error generating registration email`, "err")
         return 500;
@@ -28,19 +27,19 @@ async function createRegKey(body){
     return {status: 403, message: "forbidden, domain is not on whitelist"}
 }
 
-async function regUser(req) {
-  log.out(`registrationServices.regUser: Checking validity of : ${req.uuid}`)
-  let res = await auth.checkRequest(req.uuid)
-  log.out(`registrationServices.regUser: checkRequest returned: ${JSON.stringify(res)}`)
+async function regUser(req) { // Add input validation
+  log.out(`registrationServices.regUser: Checking validity of : ${req.uuid}`, "info")
+  const res = await auth.checkRequest(req.uuid)
+  log.out(`registrationServices.regUser: checkRequest returned: ${JSON.stringify(res)}`, "info")
     if (res.result) {
-        let uuid = await auth.generateKey()
-        let apiKey = await db.addUser(uuid, res.domain)
+        const uuid = await auth.generateKey()
+        const apiKey = await db.addUser(uuid, res.domain)
         if (apiKey) {
             db.delRegReq(req.uuid)
             return {status: 201, message: "User added", api_key: uuid}
         }
     }
-    return {status: 401, message: "Unautorised"}
+    return {status: 401, message: "Unauthorised"}
 }
 
 module.exports = {
diff --git a/src/utils/auth.utils.js b/src/utils/auth.utils.js
index d9eeb5e..0864137 100644
--- a/src/utils/auth.utils.js
+++ b/src/utils/auth.utils.js
@@ -5,27 +5,24 @@ const fs     = require('fs/promises')
 
 // Checks users registration key against issued keys
 async function isAuthed(uuid) {  // Needs testing
-    q = {uuid: uuid};
-    res = await db.query("users", q);
-    log.out(`authUtils.checkUser: DB Query answer: ${JSON.stringify(res[0])}`)
-    // Do something here to determine if authorised or not and simply return a BOOL
-    if (res[0].domain) {
-        db.userAtime(uuid)
-        return true
-    }
-    return false
+    const q = {uuid: uuid}
+    const res = await db.query("users", q)
+    log.out(`authUtils.checkUser: DB Query answer: ${JSON.stringify(res[0])}`, "dbug")
+    const authorized = res && res[0] && res[0].domain;
+    if (authorized) db.userAtime(uuid)
+    return authorized
 }
 
 // Checks whether a registration request key is valid
 async function checkRequest(key) {
-    let collection = "registrations"
-    let query = {uuid: key}
+    const collection = "registrations"
+    const query = {uuid: key}
     const res = await db.query(collection, query)
-    log.out(`authUtils.checkRequest: DB Query result: ${JSON.stringify(res)}`, "info")
-    if (res[0].time) {
-        return {result: true, domain: res[0].domain}
-    }
-    return {result: false}
+    log.out(`authUtils.checkRequest: DB Query result: ${JSON.stringify(res)}`, "dbug")
+    const result = res.length > 0 && res[0].time
+      ? { result: true, domain: res[0].domain }
+      : { result: false };
+    return result;
 }
 
 // Creates an API key for a user
diff --git a/src/utils/ldb.utils.js b/src/utils/ldb.utils.js
index a99b74d..c6c25e4 100644
--- a/src/utils/ldb.utils.js
+++ b/src/utils/ldb.utils.js
@@ -4,10 +4,10 @@ const san  = require('../utils/sanitizer.utils')     // Sanitiser
 
 async function checkCrs(input){
     var INPUT = input.toUpperCase()
-    log.out(`ldbUtils.checkCrs: Building database query to find: '${INPUT}'`, "info")
+    log.out(`ldbUtils.checkCrs: Building database query to find: '${INPUT}'`, "dbug")
     var query = {'$or':[{'3ALPHA':INPUT},{'TIPLOC':INPUT},{'STANOX':INPUT}]};
     var result = await db.query("stations", query)
-    log.out(`ldbUtils.checkCrs: Query results: ${JSON.stringify(result)}`, "info")
+    log.out(`ldbUtils.checkCrs: Query results: ${JSON.stringify(result)}`, "dbug")
     return result
 }
 
diff --git a/src/utils/log.utils.js b/src/utils/log.utils.js
index db0b3f0..5271bf4 100644
--- a/src/utils/log.utils.js
+++ b/src/utils/log.utils.js
@@ -1,7 +1,9 @@
 const environment = process.env.NODE_ENV;
 
+const hideInProduction = ["info", "dbug"]
+
 async function out(msg, level = 'othr') {
-    if (environment === "production" && level === "info") {
+    if (environment === "production" && hideInProduction.includes(level)) {
         return;
     } else {
         const time = new Date().toISOString();
diff --git a/src/utils/sanitizer.utils.js b/src/utils/sanitizer.utils.js
index c1fdbaa..e0e6e7e 100644
--- a/src/utils/sanitizer.utils.js
+++ b/src/utils/sanitizer.utils.js
@@ -38,7 +38,7 @@ function cleanNrcc(input) {
     return rmPara;
 }
 
-async function splitDomain(mail) { // Needs testing
+async function getDomainFromEmail(mail) { // Needs testing
     split = mail.split("@")
     return split[1]
 }
@@ -47,5 +47,5 @@ module.exports = {
     cleanApiEndpointTxt,
     cleanApiEndpointNum,
     cleanNrcc,
-    splitDomain
+    getDomainFromEmail
 }
\ No newline at end of file