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-rw-r--r--synapse/config/registration.py11
1 files changed, 10 insertions, 1 deletions
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index fcf99be092..685a0423c5 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -20,6 +20,13 @@ from synapse.config._base import Config, ConfigError
 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"
@@ -51,7 +58,9 @@ class RegistrationConfig(Config):
         self.bcrypt_rounds = config.get("bcrypt_rounds", 12)
 
         account_threepid_delegates = config.get("account_threepid_delegates") or {}
-        self.account_threepid_delegate_email = account_threepid_delegates.get("email")
+        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_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)