diff --git a/apps/api/src/controllers/Config.ts b/apps/api/src/controllers/Config.ts
index 99e45cb3..637755e9 100644
--- a/apps/api/src/controllers/Config.ts
+++ b/apps/api/src/controllers/Config.ts
@@ -5,6 +5,7 @@ import {
   API_URI,
   AWS_SES_REGION,
   DASHBOARD_URI,
+  DISABLE_SIGNUPS,
   GITHUB_OAUTH_ENABLED,
   GOOGLE_OAUTH_ENABLED,
   LANDING_URI,
@@ -47,6 +48,9 @@ export class Config {
           github: GITHUB_OAUTH_ENABLED,
           google: GOOGLE_OAUTH_ENABLED,
         },
+        signup: {
+          signupsDisabled: DISABLE_SIGNUPS,
+        },
         email: {
           trackingToggleEnabled: TRACKING_TOGGLE_ENABLED,
         },
diff --git a/apps/web/src/lib/hooks/useConfig.ts b/apps/web/src/lib/hooks/useConfig.ts
index 85f870d1..ba9b4aca 100644
--- a/apps/web/src/lib/hooks/useConfig.ts
+++ b/apps/web/src/lib/hooks/useConfig.ts
@@ -12,6 +12,7 @@ export interface ConfigResponse {
     billing: {enabled: boolean};
     storage: {s3Enabled: boolean};
     authProviders: {github: boolean; google: boolean};
+    signup: {signupsDisabled: boolean};
     email: {trackingToggleEnabled: boolean};
     smtp: {
       enabled: boolean;
diff --git a/apps/web/src/pages/auth/login.tsx b/apps/web/src/pages/auth/login.tsx
index 181e8e33..cece7ab0 100644
--- a/apps/web/src/pages/auth/login.tsx
+++ b/apps/web/src/pages/auth/login.tsx
@@ -63,6 +63,7 @@ export default function Login() {
     github: config?.features.authProviders.github ?? false,
     google: config?.features.authProviders.google ?? false,
   };
+  const signupsDisabled = config?.features.signup.signupsDisabled ?? false;
 
   async function onSubmit(values: z.infer<typeof AuthenticationSchemas.login>) {
     try {
@@ -295,12 +296,14 @@ export default function Login() {
                       )}
                     </Button>
 
-                    <p className="text-center text-sm text-neutral-500">
-                      Don&apos;t have an account?{' '}
-                      <Link href="/auth/signup" className="text-neutral-900 underline underline-offset-4 hover:text-neutral-600 transition-colors">
-                        Sign up
-                      </Link>
-                    </p>
+                    {!signupsDisabled && (
+                      <p className="text-center text-sm text-neutral-500">
+                        Don&apos;t have an account?{' '}
+                        <Link href="/auth/signup" className="text-neutral-900 underline underline-offset-4 hover:text-neutral-600 transition-colors">
+                          Sign up
+                        </Link>
+                      </p>
+                    )}
                   </div>
                 </form>
               </Form>
diff --git a/apps/web/src/pages/auth/signup.tsx b/apps/web/src/pages/auth/signup.tsx
index e04ee4a4..323625bc 100644
--- a/apps/web/src/pages/auth/signup.tsx
+++ b/apps/web/src/pages/auth/signup.tsx
@@ -48,6 +48,7 @@ export default function Signup() {
     github: config?.features.authProviders.github ?? false,
     google: config?.features.authProviders.google ?? false,
   };
+  const signupsDisabled = config?.features.signup.signupsDisabled ?? false;
 
   async function onSubmit(values: z.infer<typeof AuthenticationSchemas.signup>) {
     try {
@@ -96,144 +97,160 @@ export default function Signup() {
 
           <Card>
             <CardContent className="p-0">
-              <Form {...form}>
-                <form
-                  onSubmit={e => {
-                    e.preventDefault();
-                    void form.handleSubmit(onSubmit)(e);
-                  }}
-                  className="p-8"
-                >
-                  <div className="flex flex-col gap-6">
-                    <div className="flex flex-col gap-1.5">
-                      <h1 className="text-2xl font-bold tracking-tight">Create an account</h1>
-                      <p className="text-sm text-neutral-500">Start sending emails in minutes</p>
-                    </div>
+              {signupsDisabled ? (
+                <div className="p-8 flex flex-col gap-4 text-center">
+                  <h1 className="text-2xl font-bold tracking-tight">Signups are disabled</h1>
+                  <p className="text-sm text-neutral-500">
+                    New account registration is currently disabled on this instance. Please contact your administrator if you
+                    believe this is a mistake.
+                  </p>
+                  <Link
+                    href="/auth/login"
+                    className="text-sm text-neutral-900 underline underline-offset-4 hover:text-neutral-600 transition-colors"
+                  >
+                    Back to log in
+                  </Link>
+                </div>
+              ) : (
+                <Form {...form}>
+                  <form
+                    onSubmit={e => {
+                      e.preventDefault();
+                      void form.handleSubmit(onSubmit)(e);
+                    }}
+                    className="p-8"
+                  >
+                    <div className="flex flex-col gap-6">
+                      <div className="flex flex-col gap-1.5">
+                        <h1 className="text-2xl font-bold tracking-tight">Create an account</h1>
+                        <p className="text-sm text-neutral-500">Start sending emails in minutes</p>
+                      </div>
 
-                    {(oauthConfig.github || oauthConfig.google) && (
-                      <>
-                        <div className="grid gap-2">
-                          {oauthConfig.google && (
-                            <Button
-                              type="button"
-                              variant="outline"
-                              className="w-full"
-                              onClick={() => {
-                                window.location.href = `${API_URI}/oauth/google/outbound`;
-                              }}
-                            >
-                              <svg className="h-4 w-4" viewBox="0 0 24 24">
-                                <path
-                                  fill="currentColor"
-                                  d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
-                                />
-                                <path
-                                  fill="currentColor"
-                                  d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
-                                />
-                                <path
-                                  fill="currentColor"
-                                  d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
-                                />
-                                <path
-                                  fill="currentColor"
-                                  d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
-                                />
-                              </svg>
-                              Continue with Google
-                            </Button>
-                          )}
-                          {oauthConfig.github && (
-                            <Button
-                              type="button"
-                              variant="outline"
-                              className="w-full"
-                              onClick={() => {
-                                window.location.href = `${API_URI}/oauth/github/outbound`;
-                              }}
-                            >
-                              <svg className="h-4 w-4" fill="currentColor" viewBox="0 0 24 24">
-                                <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" />
-                              </svg>
-                              Continue with GitHub
-                            </Button>
-                          )}
-                        </div>
-                        <div className="relative">
-                          <div className="absolute inset-0 flex items-center">
-                            <span className="w-full border-t border-neutral-200" />
+                      {(oauthConfig.github || oauthConfig.google) && (
+                        <>
+                          <div className="grid gap-2">
+                            {oauthConfig.google && (
+                              <Button
+                                type="button"
+                                variant="outline"
+                                className="w-full"
+                                onClick={() => {
+                                  window.location.href = `${API_URI}/oauth/google/outbound`;
+                                }}
+                              >
+                                <svg className="h-4 w-4" viewBox="0 0 24 24">
+                                  <path
+                                    fill="currentColor"
+                                    d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
+                                  />
+                                  <path
+                                    fill="currentColor"
+                                    d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
+                                  />
+                                  <path
+                                    fill="currentColor"
+                                    d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
+                                  />
+                                  <path
+                                    fill="currentColor"
+                                    d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
+                                  />
+                                </svg>
+                                Continue with Google
+                              </Button>
+                            )}
+                            {oauthConfig.github && (
+                              <Button
+                                type="button"
+                                variant="outline"
+                                className="w-full"
+                                onClick={() => {
+                                  window.location.href = `${API_URI}/oauth/github/outbound`;
+                                }}
+                              >
+                                <svg className="h-4 w-4" fill="currentColor" viewBox="0 0 24 24">
+                                  <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" />
+                                </svg>
+                                Continue with GitHub
+                              </Button>
+                            )}
                           </div>
-                          <div className="relative flex justify-center text-xs uppercase">
-                            <span className="bg-white px-2 text-neutral-400 tracking-wider">or</span>
+                          <div className="relative">
+                            <div className="absolute inset-0 flex items-center">
+                              <span className="w-full border-t border-neutral-200" />
+                            </div>
+                            <div className="relative flex justify-center text-xs uppercase">
+                              <span className="bg-white px-2 text-neutral-400 tracking-wider">or</span>
+                            </div>
                           </div>
-                        </div>
-                      </>
-                    )}
-
-                    <div className="grid gap-4">
-                      <FormField
-                        control={form.control}
-                        name="email"
-                        render={({field}) => (
-                          <FormItem>
-                            <FormLabel>Email</FormLabel>
-                            <FormControl>
-                              <Input placeholder="you@example.com" autoFocus {...field} />
-                            </FormControl>
-                            <FormMessage />
-                          </FormItem>
-                        )}
-                      />
-
-                      <FormField
-                        control={form.control}
-                        name="password"
-                        render={({field}) => (
-                          <FormItem>
-                            <FormLabel>Password</FormLabel>
-                            <FormControl>
-                              <Input placeholder="At least 6 characters" type="password" {...field} />
-                            </FormControl>
-                            <FormMessage />
-                          </FormItem>
+                        </>
+                      )}
+
+                      <div className="grid gap-4">
+                        <FormField
+                          control={form.control}
+                          name="email"
+                          render={({field}) => (
+                            <FormItem>
+                              <FormLabel>Email</FormLabel>
+                              <FormControl>
+                                <Input placeholder="you@example.com" autoFocus {...field} />
+                              </FormControl>
+                              <FormMessage />
+                            </FormItem>
+                          )}
+                        />
+
+                        <FormField
+                          control={form.control}
+                          name="password"
+                          render={({field}) => (
+                            <FormItem>
+                              <FormLabel>Password</FormLabel>
+                              <FormControl>
+                                <Input placeholder="At least 6 characters" type="password" {...field} />
+                              </FormControl>
+                              <FormMessage />
+                            </FormItem>
+                          )}
+                        />
+                      </div>
+
+                      <AnimatePresence>
+                        {errorMessage && (
+                          <motion.p
+                            initial={{opacity: 0, y: -8}}
+                            animate={{opacity: 1, y: 0}}
+                            exit={{opacity: 0, y: -8}}
+                            transition={{duration: 0.15}}
+                            className="text-sm text-red-500"
+                          >
+                            {errorMessage}
+                          </motion.p>
                         )}
-                      />
-                    </div>
+                      </AnimatePresence>
 
-                    <AnimatePresence>
-                      {errorMessage && (
-                        <motion.p
-                          initial={{opacity: 0, y: -8}}
-                          animate={{opacity: 1, y: 0}}
-                          exit={{opacity: 0, y: -8}}
-                          transition={{duration: 0.15}}
-                          className="text-sm text-red-500"
-                        >
-                          {errorMessage}
-                        </motion.p>
-                      )}
-                    </AnimatePresence>
+                      <Button type="submit" className="w-full" disabled={form.formState.isSubmitting}>
+                        {form.formState.isSubmitting ? (
+                          <>
+                            <IconSpinner size="sm" />
+                            Creating account...
+                          </>
+                        ) : (
+                          'Create account'
+                        )}
+                      </Button>
 
-                    <Button type="submit" className="w-full" disabled={form.formState.isSubmitting}>
-                      {form.formState.isSubmitting ? (
-                        <>
-                          <IconSpinner size="sm" />
-                          Creating account...
-                        </>
-                      ) : (
-                        'Create account'
-                      )}
-                    </Button>
-
-                    <p className="text-center text-sm text-neutral-500">
-                      Already have an account?{' '}
-                      <Link href="/auth/login" className="text-neutral-900 underline underline-offset-4 hover:text-neutral-600 transition-colors">
-                        Log in
-                      </Link>
-                    </p>
-                  </div>
-                </form>
-              </Form>
+                      <p className="text-center text-sm text-neutral-500">
+                        Already have an account?{' '}
+                        <Link href="/auth/login" className="text-neutral-900 underline underline-offset-4 hover:text-neutral-600 transition-colors">
+                          Log in
+                        </Link>
+                      </p>
+                    </div>
+                  </form>
+                </Form>
+              )}
             </CardContent>
           </Card>
         </div>