diff --git a/.env.local.example b/.env.local.example
index ed858786..a28082c0 100644
--- a/.env.local.example
+++ b/.env.local.example
@@ -15,6 +15,8 @@
 # ************************************ platform ******************************************** 
 ############################################################################################ 
 PLATFORM_URL=http://localhost:3300
+# Generate by running in a terminal: openssl rand -hex 32 
+PLATFORM_SECRET=secretsecretsecret
 
 
 
diff --git a/apps/mail-bridge/postal-db/functions.ts b/apps/mail-bridge/postal-db/functions.ts
index c5ddb7f7..8f3fffd3 100644
--- a/apps/mail-bridge/postal-db/functions.ts
+++ b/apps/mail-bridge/postal-db/functions.ts
@@ -119,6 +119,23 @@ export type GetDomainDNSRecordsOutput =
         optimal: string;
         acceptable: string;
       };
+      mtaSts: {
+        dns: {
+          valid: boolean;
+          name: string;
+          value: string;
+        };
+        tls: {
+          valid: boolean;
+          name: string;
+          value: string;
+        };
+        policy: {
+          valid: boolean;
+          name: string;
+          value: string;
+        };
+      };
     }
   | { error: string };
 
@@ -168,6 +185,23 @@ export async function getDomainDNSRecords(
       name: '',
       optimal: '',
       acceptable: ''
+    },
+    mtaSts: {
+      dns: {
+        valid: false,
+        name: '',
+        value: ''
+      },
+      tls: {
+        valid: false,
+        name: '',
+        value: ''
+      },
+      policy: {
+        valid: false,
+        name: '',
+        value: ''
+      }
     }
   };
 
@@ -317,7 +351,7 @@ export async function getDomainDNSRecords(
   }
   records.mx.name = domainInfo.name;
   records.mx.priority = 1;
-  records.mx.value = `mx.${postalServerUrl}`;
+  records.mx.value = `${postalServerUrl}`;
   records.mx.valid = true;
 
   if (domainInfo.mxStatus !== 'OK' || forceReverify) {
@@ -360,6 +394,40 @@ export async function getDomainDNSRecords(
   records.dmarc.name = '_dmarc';
   records.dmarc.optimal = buildDmarcRecord({ p: 'reject' });
   records.dmarc.acceptable = buildDmarcRecord({ p: 'quarantine' });
+
+  const mtaStsDnsRecord = await lookupTXT(`_mta-sts.${domainInfo.name}`);
+  records.mtaSts.dns.name = '_mta-sts';
+  records.mtaSts.dns.value = `v=STSv1; id=${Date.now()}`;
+  if (mtaStsDnsRecord.success && mtaStsDnsRecord.data.length > 0) {
+    records.mtaSts.dns.valid =
+      mtaStsDnsRecord.data.filter(
+        (_) => _.startsWith('v=STSv1;') && _.includes('id=')
+      ).length === 1;
+  }
+
+  const mtaStsTlsRecord = await lookupTXT(`_smtp._tls.${domainInfo.name}`);
+  records.mtaSts.tls.name = '_smtp._tls';
+  records.mtaSts.tls.value = `v=TLSRPTv1; rua=mailto:tlsrpt@reports.uninbox.com`;
+  if (mtaStsTlsRecord.success && mtaStsTlsRecord.data.length > 0) {
+    records.mtaSts.tls.valid =
+      mtaStsTlsRecord.data.filter(
+        (_) =>
+          _.startsWith('v=TLSRPTv1;') &&
+          _.includes('rua=') &&
+          _.includes('mailto:tlsrpt@reports.uninbox.com')
+      ).length === 1;
+  }
+
+  const mtaStsPolicyRecord = await lookupCNAME(`mta-sts.${domainInfo.name}`);
+  records.mtaSts.policy.name = 'mta-sts';
+  records.mtaSts.policy.value = `mta-sts.${postalServerUrl}`;
+  if (
+    mtaStsPolicyRecord.success &&
+    mtaStsPolicyRecord.data.includes(records.mtaSts.policy.value)
+  ) {
+    records.mtaSts.policy.valid = true;
+  }
+
   return records;
 }
 
diff --git a/apps/mail-bridge/trpc/routers/domainRouter.ts b/apps/mail-bridge/trpc/routers/domainRouter.ts
index 682e4355..ef3ba7da 100644
--- a/apps/mail-bridge/trpc/routers/domainRouter.ts
+++ b/apps/mail-bridge/trpc/routers/domainRouter.ts
@@ -178,6 +178,23 @@ export const domainRouter = router({
             name: 'localhost',
             acceptable: 'v=DMARC1; p=quarantine;',
             optimal: 'v=DMARC1; p=reject;'
+          },
+          mtaSts: {
+            dns: {
+              valid: true,
+              name: 'localhost',
+              value: 'v=STSv1; id=123456789'
+            },
+            tls: {
+              valid: true,
+              name: 'localhost',
+              value: 'v=TLSRPTv1; rua=mailto:tlsrpt@localhost'
+            },
+            policy: {
+              valid: true,
+              name: 'localhost',
+              value: 'mta-sts.localhost'
+            }
           }
         } satisfies GetDomainDNSRecordsOutput;
       }
diff --git a/apps/platform/nitro.config.ts b/apps/platform/nitro.config.ts
index 7fac7dab..c102261f 100644
--- a/apps/platform/nitro.config.ts
+++ b/apps/platform/nitro.config.ts
@@ -62,6 +62,9 @@ export default defineNitroConfig({
     primaryDomain: process.env.PRIMARY_DOMAIN || 'localhost',
     mailDomains: mailDomains,
     transactionalCredentials: transactionalCredentials,
+    platform: {
+      secret: process.env.PLATFORM_SECRET || ''
+    },
     auth: {
       baseUrl: process.env.WEBAPP_URL || 'http://localhost:3000',
       secret: process.env.WEBAPP_AUTH_SECRET,
diff --git a/apps/platform/routes/caddy-check/[secret].get.ts b/apps/platform/routes/caddy-check/[secret].get.ts
new file mode 100644
index 00000000..7c36088e
--- /dev/null
+++ b/apps/platform/routes/caddy-check/[secret].get.ts
@@ -0,0 +1,43 @@
+import { useRuntimeConfig } from '#imports';
+import { db } from '@u22n/database';
+import { eq } from '@u22n/database/orm';
+import { domains } from '@u22n/database/schema';
+import {
+  eventHandler,
+  getQuery,
+  getRouterParam,
+  send,
+  setResponseStatus
+} from 'h3';
+
+export default eventHandler(async (event) => {
+  const secret = getRouterParam(event, 'secret');
+  if (useRuntimeConfig().platform.secret !== secret) {
+    setResponseStatus(event, 401);
+    return send(event, 'Unauthorized');
+  }
+
+  const domain = getQuery(event).domain;
+  if (!domain || typeof domain !== 'string') {
+    setResponseStatus(event, 400);
+    return send(event, 'Bad Request');
+  }
+
+  if (!domain.startsWith('mta-sts.')) {
+    setResponseStatus(event, 400);
+    return send(event, 'Bad Request');
+  }
+
+  const rootDomain = domain.replace(/^mta-sts\./, '');
+  const domainResponse = await db.query.domains.findFirst({
+    where: eq(domains.domain, rootDomain)
+  });
+
+  if (!domainResponse) {
+    setResponseStatus(event, 403);
+    return send(event, 'Forbidden');
+  }
+
+  setResponseStatus(event, 200);
+  return send(event, 'Ok');
+});
diff --git a/apps/platform/trpc/routers/orgRouter/mail/domainsRouter.ts b/apps/platform/trpc/routers/orgRouter/mail/domainsRouter.ts
index 12f2480e..18bffb76 100644
--- a/apps/platform/trpc/routers/orgRouter/mail/domainsRouter.ts
+++ b/apps/platform/trpc/routers/orgRouter/mail/domainsRouter.ts
@@ -299,7 +299,10 @@ export const domainsRouter = router({
         spfDnsValid: dnsRecords.spf.valid,
         returnPathDnsValid: dnsRecords.returnPath.valid,
         verification: dnsRecords.verification.valid,
-        dmarkPolicy: dnsRecords.dmarc.policy
+        dmarcPolicy: dnsRecords.dmarc.policy,
+        mtaStsDns: dnsRecords.mtaSts.dns.valid,
+        mtaStsTls: dnsRecords.mtaSts.tls.valid,
+        mtaStsPolicy: dnsRecords.mtaSts.policy.valid
       };
 
       // take all dns Records and count how many are valid, if all are valid then allOk
@@ -368,6 +371,9 @@ export const domainsRouter = router({
             dkimDnsValid: dnsStatus.dkimDnsValid,
             spfDnsValid: dnsStatus.spfDnsValid,
             returnPathDnsValid: dnsStatus.returnPathDnsValid,
+            mtaStsDnsValid: dnsStatus.mtaStsDns,
+            mtaStsTlsValid: dnsStatus.mtaStsTls,
+            mtaStsPolicyValid: dnsStatus.mtaStsPolicy,
             receivingMode: domainReceivingMode,
             sendingMode: domainSendingMode,
             lastDnsCheckAt: new Date(),
diff --git a/apps/web-app/pages/[orgShortcode]/settings/org/mail/domains/[domainId].vue b/apps/web-app/pages/[orgShortcode]/settings/org/mail/domains/[domainId].vue
index 0411f036..2d6e4926 100644
--- a/apps/web-app/pages/[orgShortcode]/settings/org/mail/domains/[domainId].vue
+++ b/apps/web-app/pages/[orgShortcode]/settings/org/mail/domains/[domainId].vue
@@ -150,7 +150,7 @@
       {
         label: 'DMARC-Record',
         slot: 'dmarc-record',
-        status: domainDnsQuery.value?.dnsStatus?.dmarkPolicy || null
+        status: domainDnsQuery.value?.dnsStatus?.dmarcPolicy || null
       }
     ];
   });
diff --git a/packages/caddy-mta-sts/Caddyfile b/packages/caddy-mta-sts/Caddyfile
new file mode 100644
index 00000000..930c86bd
--- /dev/null
+++ b/packages/caddy-mta-sts/Caddyfile
@@ -0,0 +1,13 @@
+{
+	on_demand_tls {
+		ask {env.PLATFORM_URL}/caddy-check/{env.PLATFORM_SECRET}
+	}
+}
+
+https:// {
+	tls {
+		on_demand
+	}
+	root * ./files
+	file_server
+}
diff --git a/packages/caddy-mta-sts/files/.well-known/mta-sts.txt b/packages/caddy-mta-sts/files/.well-known/mta-sts.txt
new file mode 100644
index 00000000..d3caea1e
--- /dev/null
+++ b/packages/caddy-mta-sts/files/.well-known/mta-sts.txt
@@ -0,0 +1,4 @@
+version: STSv1
+mode: enforce
+mx: *.e.uninbox.com
+max_age: 86400
\ No newline at end of file
diff --git a/packages/database/schema.ts b/packages/database/schema.ts
index b3e9ce7b..e4429612 100644
--- a/packages/database/schema.ts
+++ b/packages/database/schema.ts
@@ -559,6 +559,9 @@ export const domains = mysqlTable(
     returnPathDnsValid: boolean('return_path_dns_valid')
       .notNull()
       .default(false),
+    mtaStsDnsValid: boolean('mta_sts_dns_valid').notNull().default(false),
+    mtaStsTlsValid: boolean('mta_sts_tls_valid').notNull().default(false),
+    mtaStsPolicyValid: boolean('mta_sts_policy_valid').notNull().default(false),
     lastDnsCheckAt: timestamp('last_dns_check_at'),
     disabledAt: timestamp('disabled_at'),
     verifiedAt: timestamp('verified_at'),