* `registrations_open`: Enable registrations for anyone, invitations can be enabled when false.
* `invites_enabled`: Enable user invitations for admins (depends on `registrations_open: false`).
* `account_activation_required`: Require users to confirm their emails before signing in.
+* `account_approval_required`: Require users to be manually approved by an admin before signing in.
* `federating`: Enable federation with other instances.
* `federation_incoming_replies_max_depth`: Max. depth of reply-to activities fetching on incoming federation, to prevent out-of-memory situations while fetching very long threads. If set to `nil`, threads of any depth will be fetched. Lower this value if you experience out-of-memory crashes.
* `federation_reachability_timeout_days`: Timeout (in days) of each external federation target being unreachable prior to pausing federating to it.
* `max_remote_account_fields`: The maximum number of custom fields in the remote user profile (default: `20`).
* `account_field_name_length`: An account field name maximum length (default: `512`).
* `account_field_value_length`: An account field value maximum length (default: `2048`).
+* `registration_reason_length`: Maximum registration reason length (default: `500`).
* `external_user_synchronization`: Enabling following/followers counters synchronization for external users.
* `cleanup_attachments`: Remove attachments along with statuses. Does not affect duplicate files and attachments without status. Enabling this will increase load to database when deleting statuses on larger instances.
+* `show_reactions`: Let favourites and emoji reactions be viewed through the API (default: `true`).
## Welcome
* `direct_message`: - welcome message sent as a direct message.
* `enabled`: Enables the send a direct message to a newly registered user. Defaults to `false`.
* `sender_nickname`: The nickname of the local user that sends the welcome message.
* `message`: A message that will be send to a newly registered users as a direct message.
+* `chat_message`: - welcome message sent as a chat message.
+ * `enabled`: Enables the send a chat message to a newly registered user. Defaults to `false`.
+ * `sender_nickname`: The nickname of the local user that sends the welcome message.
+ * `message`: A message that will be send to a newly registered users as a chat message.
* `email`: - welcome message sent as a email.
* `enabled`: Enables the send a welcome email to a newly registered user. Defaults to `false`.
* `sender`: The email address or tuple with `{nickname, email}` that will use as sender to the welcome email.
* `federated_timeline_removal`: List of instances to remove from Federated (aka The Whole Known Network) Timeline.
* `reject`: List of instances to reject any activities from.
* `accept`: List of instances to accept any activities from.
+* `followers_only`: List of instances to decrease post visibility to only the followers, including for DM mentions.
* `report_removal`: List of instances to reject reports from.
* `avatar_removal`: List of instances to strip avatars from.
* `banner_removal`: List of instances to strip banners from.
* `sign_object_fetches`: Sign object fetches with HTTP signatures
* `authorized_fetch_mode`: Require HTTP signatures for AP fetches
+## Pleroma.User
+
+* `restricted_nicknames`: List of nicknames users may not register with.
+* `email_blacklist`: List of email domains users may not register with.
+
## Pleroma.ScheduledActivity
* `daily_user_limit`: the number of scheduled activities a user is allowed to create in a single day (Default: `25`)