diff --git a/helpers/mail.ts b/helpers/mail.ts
index 9d315c8..61943d2 100644
--- a/helpers/mail.ts
+++ b/helpers/mail.ts
@@ -1,3 +1,5 @@
+import { getBaseURL } from './url'
+
 const SENDGRID_API_KEY = process.env.SENDGRID_API_KEY
 const SENDGRID_URL = 'https://api.sendgrid.com/v3/mail/send'
 // TODO: move to env
@@ -31,7 +33,7 @@ async function sendMail(data: object) {
 function getReceivedBookingText(booking: { uuid: string }) {
   return `Hallo lieber Admin,
 
-  es ging folgende Buchung ein: https://${process.env.VERCEL_URL}/booking/${booking.uuid}
+  es ging folgende Buchung ein: {getBaseURL()}/booking/${booking.uuid}
 
   MfG`
 }
diff --git a/helpers/url.ts b/helpers/url.ts
new file mode 100644
index 0000000..df9f9a2
--- /dev/null
+++ b/helpers/url.ts
@@ -0,0 +1,7 @@
+const URL = process.env.VERCEL_URL
+  ? `https://${process.env.VERCEL_URL}`
+  : 'http://localhost:3000'
+
+export function getBaseURL(): string {
+  return URL
+}