diff --git a/CHANGES.md b/CHANGES.md
index da588454c741..4cb75f4bd5d4 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,13 @@
+Synapse vNext
+=============
+
+This patch version reverts the earlier full deprecation of delegating e-mail validation from Synapse 1.64.0rc1, which causes problems in certain deployments. It will be deprecated in a timely manner in a future release.
+
+Internal Changes
+----------------
+
+- Revert ([\#13192](https://github.com/matrix-org/synapse/issues/13192)) from 1.64.0rc1. ([\#TODO](https://github.com/matrix-org/synapse/issues/TODO))
+
 Synapse 1.64.0rc1 (2022-07-26)
 ==============================
 
diff --git a/docs/upgrade.md b/docs/upgrade.md
index fadb8e7ffb16..73ed2099751a 100644
--- a/docs/upgrade.md
+++ b/docs/upgrade.md
@@ -91,19 +91,6 @@ process, for example:
 
 # Upgrading to v1.64.0
 
-## Delegation of email validation no longer supported
-
-As of this version, Synapse no longer allows the tasks of verifying email address
-ownership, and password reset confirmation, to be delegated to an identity server.
-
-To continue to allow users to add email addresses to their homeserver accounts,
-and perform password resets, make sure that Synapse is configured with a
-working email server in the `email` configuration section (including, at a
-minimum, a `notif_from` setting.)
-
-Specifying an `email` setting under `account_threepid_delegates` will now cause
-an error at startup.
-
 ## Changes to the event replication streams
 
 Synapse now includes a flag indicating if an event is an outlier when
diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index eefcc7829df8..e78bd94015e4 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -2200,26 +2200,30 @@ default_identity_server: https://matrix.org
 ---
 ### `account_threepid_delegates`
 
-Delegate verification of phone numbers to an identity server.
+Handle threepid (email/phone etc) registration and password resets through a set of
+*trusted* identity servers. Note that this allows the configured identity server to
+reset passwords for accounts!
 
-When a user wishes to add a phone number to their account, we need to verify that they
-actually own that phone number, which requires sending them a text message (SMS).
-Currently Synapse does not support sending those texts itself and instead delegates the
-task to an identity server. The base URI for the identity server to be used is
-specified by the `account_threepid_delegates.msisdn` option.
+Be aware that if `email` is not set, and SMTP options have not been
+configured in the email config block, registration and user password resets via
+email will be globally disabled.
 
-If this is left unspecified, Synapse will not allow users to add phone numbers to
-their account.
+Additionally, if `msisdn` is not set, registration and password resets via msisdn
+will be disabled regardless, and users will not be able to associate an msisdn
+identifier to their account. This is due to Synapse currently not supporting
+any method of sending SMS messages on its own.
 
-(Servers handling the these requests must answer the `/requestToken` endpoints defined
-by the Matrix Identity Service API
-[specification](https://matrix.org/docs/spec/identity_service/latest).)
+To enable using an identity server for operations regarding a particular third-party
+identifier type, set the value to the URL of that identity server as shown in the
+examples below.
 
-*Updated in Synapse 1.64.0*: No longer accepts an `email` option.
+Servers handling the these requests must answer the `/requestToken` endpoints defined
+by the Matrix Identity Service API [specification](https://matrix.org/docs/spec/identity_service/latest).
 
 Example configuration:
 ```yaml
 account_threepid_delegates:
+    email: https://example.com     # Delegate email sending to example.com
     msisdn: http://localhost:8090  # Delegate SMS sending to this local process
 ```
 ---
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index 6bafa7d3f3a6..745e7041414f 100644
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -44,6 +44,7 @@
     register_start,
 )
 from synapse.config._base import ConfigError, format_config_error
+from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.config.homeserver import HomeServerConfig
 from synapse.config.server import ListenerConfig
 from synapse.federation.transport.server import TransportLayerServer
@@ -201,7 +202,7 @@ def _configure_named_resource(
                 }
             )
 
-            if self.config.email.can_verify_email:
+            if self.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
                 from synapse.rest.synapse.client.password_reset import (
                     PasswordResetSubmitTokenResource,
                 )
diff --git a/synapse/config/emailconfig.py b/synapse/config/emailconfig.py
index 73b469f41480..c3b2f2bf64bc 100644
--- a/synapse/config/emailconfig.py
+++ b/synapse/config/emailconfig.py
@@ -18,6 +18,7 @@
 import email.utils
 import logging
 import os
+from enum import Enum
 from typing import Any
 
 import attr
@@ -135,22 +136,41 @@ def read_config(self, config: JsonDict, **kwargs: Any) -> None:
 
         self.email_enable_notifs = email_config.get("enable_notifs", False)
 
+        self.threepid_behaviour_email = (
+            # Have Synapse handle the email sending if account_threepid_delegates.email
+            # is not defined
+            # msisdn is currently always remote while Synapse does not support any method of
+            # sending SMS messages
+            ThreepidBehaviour.REMOTE
+            if self.root.registration.account_threepid_delegate_email
+            else ThreepidBehaviour.LOCAL
+        )
+
         if config.get("trust_identity_server_for_password_resets"):
             raise ConfigError(
                 'The config option "trust_identity_server_for_password_resets" '
-                "is no longer supported. Please remove it from the config file."
+                'has been replaced by "account_threepid_delegate". '
+                "Please consult the configuration manual at docs/usage/configuration/config_documentation.md for "
+                "details and update your config file."
             )
 
-        # If we have email config settings, assume that we can verify ownership of
-        # email addresses.
-        self.can_verify_email = email_config != {}
+        self.local_threepid_handling_disabled_due_to_email_config = False
+        if (
+            self.threepid_behaviour_email == ThreepidBehaviour.LOCAL
+            and email_config == {}
+        ):
+            # We cannot warn the user this has happened here
+            # Instead do so when a user attempts to reset their password
+            self.local_threepid_handling_disabled_due_to_email_config = True
+
+            self.threepid_behaviour_email = ThreepidBehaviour.OFF
 
         # Get lifetime of a validation token in milliseconds
         self.email_validation_token_lifetime = self.parse_duration(
             email_config.get("validation_token_lifetime", "1h")
         )
 
-        if self.can_verify_email:
+        if self.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             missing = []
             if not self.email_notif_from:
                 missing.append("email.notif_from")
@@ -341,3 +361,18 @@ def read_config(self, config: JsonDict, **kwargs: Any) -> None:
                     "Config option email.invite_client_location must be a http or https URL",
                     path=("email", "invite_client_location"),
                 )
+
+
+class ThreepidBehaviour(Enum):
+    """
+    Enum to define the behaviour of Synapse with regards to when it contacts an identity
+    server for 3pid registration and password resets
+
+    REMOTE = use an external server to send tokens
+    LOCAL = send tokens ourselves
+    OFF = disable registration via 3pid and password resets
+    """
+
+    REMOTE = "remote"
+    LOCAL = "local"
+    OFF = "off"
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 685a0423c5ea..fcf99be092b4 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -20,13 +20,6 @@
 from synapse.types import JsonDict, RoomAlias, UserID
 from synapse.util.stringutils import random_string_with_symbols, strtobool
 
-NO_EMAIL_DELEGATE_ERROR = """\
-Delegation of email verification to an identity server is no longer supported. To
-continue to allow users to add email addresses to their accounts, and use them for
-password resets, configure Synapse with an SMTP server via the `email` setting, and
-remove `account_threepid_delegates.email`.
-"""
-
 
 class RegistrationConfig(Config):
     section = "registration"
@@ -58,9 +51,7 @@ def read_config(self, config: JsonDict, **kwargs: Any) -> None:
         self.bcrypt_rounds = config.get("bcrypt_rounds", 12)
 
         account_threepid_delegates = config.get("account_threepid_delegates") or {}
-        if "email" in account_threepid_delegates:
-            raise ConfigError(NO_EMAIL_DELEGATE_ERROR)
-        # self.account_threepid_delegate_email = account_threepid_delegates.get("email")
+        self.account_threepid_delegate_email = account_threepid_delegates.get("email")
         self.account_threepid_delegate_msisdn = account_threepid_delegates.get("msisdn")
         self.default_identity_server = config.get("default_identity_server")
         self.allow_guest_access = config.get("allow_guest_access", False)
diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index 9571d461c8ec..c281763b6594 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -26,6 +26,7 @@
     SynapseError,
 )
 from synapse.api.ratelimiting import Ratelimiter
+from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.http import RequestTimedOutError
 from synapse.http.client import SimpleHttpClient
 from synapse.http.site import SynapseRequest
@@ -415,6 +416,48 @@ async def send_threepid_validation(
 
         return session_id
 
+    async def requestEmailToken(
+        self,
+        id_server: str,
+        email: str,
+        client_secret: str,
+        send_attempt: int,
+        next_link: Optional[str] = None,
+    ) -> JsonDict:
+        """
+        Request an external server send an email on our behalf for the purposes of threepid
+        validation.
+
+        Args:
+            id_server: The identity server to proxy to
+            email: The email to send the message to
+            client_secret: The unique client_secret sends by the user
+            send_attempt: Which attempt this is
+            next_link: A link to redirect the user to once they submit the token
+
+        Returns:
+            The json response body from the server
+        """
+        params = {
+            "email": email,
+            "client_secret": client_secret,
+            "send_attempt": send_attempt,
+        }
+        if next_link:
+            params["next_link"] = next_link
+
+        try:
+            data = await self.http_client.post_json_get_json(
+                id_server + "/_matrix/identity/api/v1/validate/email/requestToken",
+                params,
+            )
+            return data
+        except HttpResponseException as e:
+            logger.info("Proxied requestToken failed: %r", e)
+            raise e.to_synapse_error()
+        except RequestTimedOutError:
+            raise SynapseError(500, "Timed out contacting identity server")
+
     async def requestMsisdnToken(
         self,
         id_server: str,
@@ -488,7 +531,18 @@ async def validate_threepid_session(
         validation_session = None
 
         # Try to validate as email
-        if self.hs.config.email.can_verify_email:
+        if self.hs.config.email.threepid_behaviour_email == ThreepidBehaviour.REMOTE:
+            # Remote emails will only be used if a valid identity server is provided.
+            assert (
+                self.hs.config.registration.account_threepid_delegate_email is not None
+            )
+
+            # Ask our delegated email identity server
+            validation_session = await self.threepid_from_creds(
+                self.hs.config.registration.account_threepid_delegate_email,
+                threepid_creds,
+            )
+        elif self.hs.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             # Get a validated session matching these details
             validation_session = await self.store.get_threepid_validation_session(
                 "email", client_secret, sid=sid, validated=True
diff --git a/synapse/handlers/ui_auth/checkers.py b/synapse/handlers/ui_auth/checkers.py
index a744d68c648a..05cebb5d4d89 100644
--- a/synapse/handlers/ui_auth/checkers.py
+++ b/synapse/handlers/ui_auth/checkers.py
@@ -19,6 +19,7 @@
 
 from synapse.api.constants import LoginType
 from synapse.api.errors import Codes, LoginError, SynapseError
+from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.util import json_decoder
 
 if TYPE_CHECKING:
@@ -152,7 +153,7 @@ async def _check_threepid(self, medium: str, authdict: dict) -> dict:
 
         logger.info("Getting validated threepid. threepidcreds: %r", (threepid_creds,))
 
-        # msisdns are currently always verified via the IS
+        # msisdns are currently always ThreepidBehaviour.REMOTE
         if medium == "msisdn":
             if not self.hs.config.registration.account_threepid_delegate_msisdn:
                 raise SynapseError(
@@ -163,7 +164,18 @@ async def _check_threepid(self, medium: str, authdict: dict) -> dict:
                 threepid_creds,
             )
         elif medium == "email":
-            if self.hs.config.email.can_verify_email:
+            if (
+                self.hs.config.email.threepid_behaviour_email
+                == ThreepidBehaviour.REMOTE
+            ):
+                assert self.hs.config.registration.account_threepid_delegate_email
+                threepid = await identity_handler.threepid_from_creds(
+                    self.hs.config.registration.account_threepid_delegate_email,
+                    threepid_creds,
+                )
+            elif (
+                self.hs.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL
+            ):
                 threepid = None
                 row = await self.store.get_threepid_validation_session(
                     medium,
@@ -215,7 +227,10 @@ def __init__(self, hs: "HomeServer"):
         _BaseThreepidAuthChecker.__init__(self, hs)
 
     def is_enabled(self) -> bool:
-        return self.hs.config.email.can_verify_email
+        return self.hs.config.email.threepid_behaviour_email in (
+            ThreepidBehaviour.REMOTE,
+            ThreepidBehaviour.LOCAL,
+        )
 
     async def check_auth(self, authdict: dict, clientip: str) -> Any:
         return await self._check_threepid("email", authdict)
diff --git a/synapse/rest/client/account.py b/synapse/rest/client/account.py
index 0cc87a400179..f179fb2606cd 100644
--- a/synapse/rest/client/account.py
+++ b/synapse/rest/client/account.py
@@ -28,6 +28,7 @@
     SynapseError,
     ThreepidValidationError,
 )
+from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.handlers.ui_auth import UIAuthSessionDataConstants
 from synapse.http.server import HttpServer, finish_request, respond_with_html
 from synapse.http.servlet import (
@@ -63,7 +64,7 @@ def __init__(self, hs: "HomeServer"):
         self.config = hs.config
         self.identity_handler = hs.get_identity_handler()
 
-        if self.config.email.can_verify_email:
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             self.mailer = Mailer(
                 hs=self.hs,
                 app_name=self.config.email.email_app_name,
@@ -72,10 +73,11 @@ def __init__(self, hs: "HomeServer"):
             )
 
     async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
-        if not self.config.email.can_verify_email:
-            logger.warning(
-                "User password resets have been disabled due to lack of email config"
-            )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.OFF:
+            if self.config.email.local_threepid_handling_disabled_due_to_email_config:
+                logger.warning(
+                    "User password resets have been disabled due to lack of email config"
+                )
             raise SynapseError(
                 400, "Email-based password resets have been disabled on this server"
             )
@@ -127,21 +129,35 @@ async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
 
             raise SynapseError(400, "Email not found", Codes.THREEPID_NOT_FOUND)
 
-        # Send password reset emails from Synapse
-        sid = await self.identity_handler.send_threepid_validation(
-            email,
-            client_secret,
-            send_attempt,
-            self.mailer.send_password_reset_mail,
-            next_link,
-        )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.REMOTE:
+            assert self.hs.config.registration.account_threepid_delegate_email
+
+            # Have the configured identity server handle the request
+            ret = await self.identity_handler.requestEmailToken(
+                self.hs.config.registration.account_threepid_delegate_email,
+                email,
+                client_secret,
+                send_attempt,
+                next_link,
+            )
+        else:
+            # Send password reset emails from Synapse
+            sid = await self.identity_handler.send_threepid_validation(
+                email,
+                client_secret,
+                send_attempt,
+                self.mailer.send_password_reset_mail,
+                next_link,
+            )
+
+            # Wrap the session id in a JSON object
+            ret = {"sid": sid}
 
         threepid_send_requests.labels(type="email", reason="password_reset").observe(
             send_attempt
         )
 
-        # Wrap the session id in a JSON object
-        return 200, {"sid": sid}
+        return 200, ret
 
 
 class PasswordRestServlet(RestServlet):
@@ -333,7 +349,7 @@ def __init__(self, hs: "HomeServer"):
         self.identity_handler = hs.get_identity_handler()
         self.store = self.hs.get_datastores().main
 
-        if self.config.email.can_verify_email:
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             self.mailer = Mailer(
                 hs=self.hs,
                 app_name=self.config.email.email_app_name,
@@ -342,10 +358,11 @@ def __init__(self, hs: "HomeServer"):
             )
 
     async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
-        if not self.config.email.can_verify_email:
-            logger.warning(
-                "Adding emails have been disabled due to lack of an email config"
-            )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.OFF:
+            if self.config.email.local_threepid_handling_disabled_due_to_email_config:
+                logger.warning(
+                    "Adding emails have been disabled due to lack of an email config"
+                )
             raise SynapseError(
                 400, "Adding an email to your account is disabled on this server"
             )
@@ -396,20 +413,35 @@ async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
 
             raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
 
-        sid = await self.identity_handler.send_threepid_validation(
-            email,
-            client_secret,
-            send_attempt,
-            self.mailer.send_add_threepid_mail,
-            next_link,
-        )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.REMOTE:
+            assert self.hs.config.registration.account_threepid_delegate_email
+
+            # Have the configured identity server handle the request
+            ret = await self.identity_handler.requestEmailToken(
+                self.hs.config.registration.account_threepid_delegate_email,
+                email,
+                client_secret,
+                send_attempt,
+                next_link,
+            )
+        else:
+            # Send threepid validation emails from Synapse
+            sid = await self.identity_handler.send_threepid_validation(
+                email,
+                client_secret,
+                send_attempt,
+                self.mailer.send_add_threepid_mail,
+                next_link,
+            )
+
+            # Wrap the session id in a JSON object
+            ret = {"sid": sid}
 
         threepid_send_requests.labels(type="email", reason="add_threepid").observe(
             send_attempt
         )
 
-        # Wrap the session id in a JSON object
-        return 200, {"sid": sid}
+        return 200, ret
 
 
 class MsisdnThreepidRequestTokenRestServlet(RestServlet):
@@ -502,19 +534,26 @@ def __init__(self, hs: "HomeServer"):
         self.config = hs.config
         self.clock = hs.get_clock()
         self.store = hs.get_datastores().main
-        if self.config.email.can_verify_email:
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             self._failure_email_template = (
                 self.config.email.email_add_threepid_template_failure_html
             )
 
     async def on_GET(self, request: Request) -> None:
-        if not self.config.email.can_verify_email:
-            logger.warning(
-                "Adding emails have been disabled due to lack of an email config"
-            )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.OFF:
+            if self.config.email.local_threepid_handling_disabled_due_to_email_config:
+                logger.warning(
+                    "Adding emails have been disabled due to lack of an email config"
+                )
             raise SynapseError(
                 400, "Adding an email to your account is disabled on this server"
             )
+        elif self.config.email.threepid_behaviour_email == ThreepidBehaviour.REMOTE:
+            raise SynapseError(
+                400,
+                "This homeserver is not validating threepids. Use an identity server "
+                "instead.",
+            )
 
         sid = parse_string(request, "sid", required=True)
         token = parse_string(request, "token", required=True)
diff --git a/synapse/rest/client/register.py b/synapse/rest/client/register.py
index a8402cdb3a51..e8e51a9c66ad 100644
--- a/synapse/rest/client/register.py
+++ b/synapse/rest/client/register.py
@@ -31,6 +31,7 @@
 )
 from synapse.api.ratelimiting import Ratelimiter
 from synapse.config import ConfigError
+from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.config.homeserver import HomeServerConfig
 from synapse.config.ratelimiting import FederationRateLimitConfig
 from synapse.config.server import is_threepid_reserved
@@ -73,7 +74,7 @@ def __init__(self, hs: "HomeServer"):
         self.identity_handler = hs.get_identity_handler()
         self.config = hs.config
 
-        if self.hs.config.email.can_verify_email:
+        if self.hs.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             self.mailer = Mailer(
                 hs=self.hs,
                 app_name=self.config.email.email_app_name,
@@ -82,10 +83,13 @@ def __init__(self, hs: "HomeServer"):
             )
 
     async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
-        if not self.hs.config.email.can_verify_email:
-            logger.warning(
-                "Email registration has been disabled due to lack of email config"
-            )
+        if self.hs.config.email.threepid_behaviour_email == ThreepidBehaviour.OFF:
+            if (
+                self.hs.config.email.local_threepid_handling_disabled_due_to_email_config
+            ):
+                logger.warning(
+                    "Email registration has been disabled due to lack of email config"
+                )
             raise SynapseError(
                 400, "Email-based registration has been disabled on this server"
             )
@@ -134,21 +138,35 @@ async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
 
             raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
 
-        # Send registration emails from Synapse
-        sid = await self.identity_handler.send_threepid_validation(
-            email,
-            client_secret,
-            send_attempt,
-            self.mailer.send_registration_mail,
-            next_link,
-        )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.REMOTE:
+            assert self.hs.config.registration.account_threepid_delegate_email
+
+            # Have the configured identity server handle the request
+            ret = await self.identity_handler.requestEmailToken(
+                self.hs.config.registration.account_threepid_delegate_email,
+                email,
+                client_secret,
+                send_attempt,
+                next_link,
+            )
+        else:
+            # Send registration emails from Synapse
+            sid = await self.identity_handler.send_threepid_validation(
+                email,
+                client_secret,
+                send_attempt,
+                self.mailer.send_registration_mail,
+                next_link,
+            )
+
+            # Wrap the session id in a JSON object
+            ret = {"sid": sid}
 
         threepid_send_requests.labels(type="email", reason="register").observe(
             send_attempt
         )
 
-        # Wrap the session id in a JSON object
-        return 200, {"sid": sid}
+        return 200, ret
 
 
 class MsisdnRegisterRequestTokenRestServlet(RestServlet):
@@ -242,7 +260,7 @@ def __init__(self, hs: "HomeServer"):
         self.clock = hs.get_clock()
         self.store = hs.get_datastores().main
 
-        if self.config.email.can_verify_email:
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
             self._failure_email_template = (
                 self.config.email.email_registration_template_failure_html
             )
@@ -252,10 +270,11 @@ async def on_GET(self, request: Request, medium: str) -> None:
             raise SynapseError(
                 400, "This medium is currently not supported for registration"
             )
-        if not self.config.email.can_verify_email:
-            logger.warning(
-                "User registration via email has been disabled due to lack of email config"
-            )
+        if self.config.email.threepid_behaviour_email == ThreepidBehaviour.OFF:
+            if self.config.email.local_threepid_handling_disabled_due_to_email_config:
+                logger.warning(
+                    "User registration via email has been disabled due to lack of email config"
+                )
             raise SynapseError(
                 400, "Email-based registration is disabled on this server"
             )
diff --git a/synapse/rest/synapse/client/password_reset.py b/synapse/rest/synapse/client/password_reset.py
index b9402cfb757a..6ac9dbc7c9be 100644
--- a/synapse/rest/synapse/client/password_reset.py
+++ b/synapse/rest/synapse/client/password_reset.py
@@ -17,6 +17,7 @@
 from twisted.web.server import Request
 
 from synapse.api.errors import ThreepidValidationError
+from synapse.config.emailconfig import ThreepidBehaviour
 from synapse.http.server import DirectServeHtmlResource
 from synapse.http.servlet import parse_string
 from synapse.util.stringutils import assert_valid_client_secret
@@ -45,6 +46,9 @@ def __init__(self, hs: "HomeServer"):
         self.clock = hs.get_clock()
         self.store = hs.get_datastores().main
 
+        self._local_threepid_handling_disabled_due_to_email_config = (
+            hs.config.email.local_threepid_handling_disabled_due_to_email_config
+        )
         self._confirmation_email_template = (
             hs.config.email.email_password_reset_template_confirmation_html
         )
@@ -55,8 +59,8 @@ def __init__(self, hs: "HomeServer"):
             hs.config.email.email_password_reset_template_failure_html
         )
 
-        # This resource should only be mounted if email validation is enabled
-        assert hs.config.email.can_verify_email
+        # This resource should not be mounted if threepid behaviour is not LOCAL
+        assert hs.config.email.threepid_behaviour_email == ThreepidBehaviour.LOCAL
 
     async def _async_render_GET(self, request: Request) -> Tuple[int, bytes]:
         sid = parse_string(request, "sid", required=True)
diff --git a/tests/rest/client/test_register.py b/tests/rest/client/test_register.py
index 071b488cc0a5..f8e64ce6ac9c 100644
--- a/tests/rest/client/test_register.py
+++ b/tests/rest/client/test_register.py
@@ -586,9 +586,9 @@ def test_advertised_flows(self) -> None:
                 "require_at_registration": True,
             },
             "account_threepid_delegates": {
+                "email": "https://id_server",
                 "msisdn": "https://id_server",
             },
-            "email": {"notif_from": "Synapse <synapse@example.com>"},
         }
     )
     def test_advertised_flows_captcha_and_terms_and_3pids(self) -> None: