diff --git a/packages/backend/src/types.ts b/packages/backend/src/types.ts
index ce587bf..7e6e7da 100644
--- a/packages/backend/src/types.ts
+++ b/packages/backend/src/types.ts
@@ -1,25 +1,42 @@
-import { isAddress } from "viem";
-import z from "zod";
+import { isAddress } from 'viem';
+import z from 'zod';
 
 export const SendOtpSchema = z.object({
-  email: z.string().email().endsWith("@pse.dev").refine(email => !email.includes('+'), {
-    message: "Email must not contain '+'"
-  }),
+  email: z
+    .string()
+    .email()
+    .refine(
+      (email) => {
+        return (
+          (email.endsWith('@pse.dev') || email.endsWith('@ethereum.org')) && !email.includes('+')
+        );
+      },
+      {
+        message: "Email must be from '@pse.dev' or '@ethereum.org' and must not contain '+'"
+      }
+    )
 });
 
 export type SendOtp = z.infer<typeof SendOtpSchema>;
 
 export const VerifyOtpSchema = z.object({
-  email: z.string()
+  email: z
+    .string()
     .email()
-    .endsWith("@pse.dev")
-    .refine(email => !email.includes('+'), {
-      message: "Email must not contain '+'"
-    }),
+    .refine(
+      (email) => {
+        return (
+          (email.endsWith('@pse.dev') || email.endsWith('@ethereum.org')) && !email.includes('+')
+        );
+      },
+      {
+        message: "Email must be from '@pse.dev' or '@ethereum.org' and must not contain '+'"
+      }
+    ),
   otp: z.number().int().gte(100000).lte(999999),
   address: z.string().refine(isAddress, {
-    message: "Invalid address",
-  }),
+    message: 'Invalid address'
+  })
 });
 
 export type VerifyOtp = z.infer<typeof VerifyOtpSchema>;
diff --git a/packages/interface/src/features/signup/components/RegisterEmail.tsx b/packages/interface/src/features/signup/components/RegisterEmail.tsx
index 4fc9494..1221d32 100644
--- a/packages/interface/src/features/signup/components/RegisterEmail.tsx
+++ b/packages/interface/src/features/signup/components/RegisterEmail.tsx
@@ -1,62 +1,62 @@
-import { Dispatch, SetStateAction, useState } from "react";
-import { toast } from "sonner";
+import { Dispatch, SetStateAction, useState } from "react"
+import { toast } from "sonner"
 
-import { config } from "~/config";
-import { Form, FormControl, FormSection } from "~/components/ui/Form";
-import { Input } from "~/components/ui/Input";
-import { EmailFieldSchema, EmailField } from "../types";
-import { Button } from "~/components/ui/Button";
-import { Spinner } from "~/components/ui/Spinner";
+import { config } from "~/config"
+import { Form, FormControl, FormSection } from "~/components/ui/Form"
+import { Input } from "~/components/ui/Input"
+import { EmailFieldSchema, EmailField } from "../types"
+import { Button } from "~/components/ui/Button"
+import { Spinner } from "~/components/ui/Spinner"
 
 interface IRegisterEmailProps {
   emailField:
-    | {
-        email: string;
-      }
-    | undefined;
+  | {
+    email: string
+  }
+  | undefined
   setEmail: Dispatch<
     SetStateAction<
       | {
-          email: string;
-        }
+        email: string
+      }
       | undefined
     >
-  >;
+  >
 }
 
 const RegisterEmail = ({
   emailField,
   setEmail,
 }: IRegisterEmailProps): JSX.Element => {
-  const [registering, setRegistering] = useState(false);
+  const [registering, setRegistering] = useState(false)
 
   const registerEmail = async (emailField: EmailField) => {
     try {
-      setRegistering(true);
+      setRegistering(true)
       const response = await fetch(`${config.backendUrl}/send-otp`, {
         method: "POST",
         headers: {
           "Content-Type": "application/json",
         },
         body: JSON.stringify(emailField),
-      });
-      const json = await response.json();
+      })
+      const json = await response.json()
 
       if (!response.ok) {
-        console.log(response.status);
-        console.error(json);
-        toast.error((json.errors && json.errors[0]) ?? json.message);
+        console.log(response.status)
+        console.error(json)
+        toast.error((json.errors && json.errors[0]) ?? json.message)
       } else {
-        setEmail(emailField);
-        toast.success(`OTP has been sent to ${emailField.email}`);
+        setEmail(emailField)
+        toast.success(`OTP has been sent to ${emailField.email}`)
       }
     } catch (error: any) {
-      console.error(error);
-      toast.error("An unexpected error occured registering your email");
+      console.error(error)
+      toast.error("An unexpected error occured registering your email")
     } finally {
-      setRegistering(false);
+      setRegistering(false)
     }
-  };
+  }
 
   return (
     <div className="w-72 sm:w-96">
@@ -65,16 +65,16 @@ const RegisterEmail = ({
         onSubmit={(email) => registerEmail(email)}
       >
         <FormSection
-          description="Please register with your 'pse.dev' email."
+          description="Please register with your 'pse.dev' or 'ethereum.org' email."
           title="Register"
         >
           <FormControl
             required
-            hint="This is your 'pse.dev' email address"
+            hint="This is your 'pse.dev' or 'ethereum.org' email address"
             label="Email address"
             name="email"
           >
-            <Input placeholder="bob@pse.dev" />
+            <Input placeholder="bob@pse.dev | aa@ethereum.org" />
           </FormControl>
           <Button
             suppressHydrationWarning
@@ -87,7 +87,7 @@ const RegisterEmail = ({
         </FormSection>
       </Form>
     </div>
-  );
-};
+  )
+}
 
-export default RegisterEmail;
+export default RegisterEmail
diff --git a/packages/interface/src/features/signup/components/VerifyOtp.tsx b/packages/interface/src/features/signup/components/VerifyOtp.tsx
index 5256896..544bed9 100644
--- a/packages/interface/src/features/signup/components/VerifyOtp.tsx
+++ b/packages/interface/src/features/signup/components/VerifyOtp.tsx
@@ -157,7 +157,7 @@ const VerifyOtp = ({ emailField }: IVerifyOtpProps): JSX.Element => {
             <FormControl
               required
               valueAsNumber
-              hint="Check your 'pse.dev' inbox for the OTP"
+              hint="Check your 'pse.dev' or 'ethereum.org' inbox for the OTP"
               label="OTP"
               name="otp"
             >