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-rw-r--r--docs/upgrade.md15
-rw-r--r--docs/usage/configuration/config_documentation.md28
2 files changed, 27 insertions, 16 deletions
diff --git a/docs/upgrade.md b/docs/upgrade.md
index 312f0b87fe..3aaeb499ce 100644
--- a/docs/upgrade.md
+++ b/docs/upgrade.md
@@ -89,6 +89,21 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# 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.
+
 # Upgrading to v1.62.0
 
 ## New signatures for spam checker callbacks
diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index 5deabb53d7..5fe502e33a 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -2168,30 +2168,26 @@ default_identity_server: https://matrix.org
 ---
 ### `account_threepid_delegates`
 
-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!
+Delegate verification of phone numbers to an identity server.
 
-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.
+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.
 
-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.
+If this is left unspecified, Synapse will not allow users to add phone numbers to
+their account.
 
-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.
+(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).)
 
-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).
+*Updated in Synapse 1.64.0*: No longer accepts an `email` option.
 
 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
 ```
 ---