## Pleroma.Emails.Mailer
* `adapter`: one of the mail adapters listed in [Swoosh readme](https://github.com/swoosh/swoosh#adapters), or `Swoosh.Adapters.Local` for in-memory mailbox.
* `api_key` / `password` and / or other adapter-specific settings, per the above documentation.
+* `enabled`: Allows enable/disable send emails. Default: `false`.
An example for Sendgrid adapter:
* `invites_enabled`: Enable user invitations for admins (depends on `registrations_open: false`).
* `account_activation_required`: Require users to confirm their emails 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 memory leakage on extremely nested incoming threads). If set to `nil`, threads of any depth will be fetched.
+* `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.
* `allow_relay`: Enable Pleroma’s Relay, which makes it possible to follow a whole instance
* `rewrite_policy`: Message Rewrite Policy, either one or a list. Here are the ones available by default:
* `managed_config`: Whenether the config for pleroma-fe is configured in this config or in ``static/config.json``
* `allowed_post_formats`: MIME-type list of formats allowed to be posted (transformed into HTML)
* `mrf_transparency`: Make the content of your Message Rewrite Facility settings public (via nodeinfo).
+* `mrf_transparency_exclusions`: Exclude specific instance names from MRF transparency. The use of the exclusions feature will be disclosed in nodeinfo as a boolean value.
* `scope_copy`: Copy the scope (private/unlisted/public) in replies to posts by default.
* `subject_line_behavior`: Allows changing the default behaviour of subject lines in replies. Valid values:
* "email": Copy and preprend re:, as in email.
* `skip_thread_containment`: Skip filter out broken threads. The default is `false`.
* `limit_to_local_content`: Limit unauthenticated users to search for local statutes and users only. Possible values: `:unauthenticated`, `:all` and `false`. The default is `:unauthenticated`.
* `dynamic_configuration`: Allow transferring configuration to DB with the subsequent customization from Admin api.
+* `external_user_synchronization`: Enabling following/followers counters synchronization for external users.
+
## :logger
* `enabled`: if enabled the instance will parse metadata from attached links to generate link previews
* `ignore_hosts`: list of hosts which will be ignored by the metadata parser. For example `["accounts.google.com", "xss.website"]`, defaults to `[]`.
* `ignore_tld`: list TLDs (top-level domains) which will ignore for parse metadata. default is ["local", "localdomain", "lan"]
+* `parsers`: list of Rich Media parsers
## :fetch_initial_posts
* `enabled`: if enabled, when a new user is federated with, fetch some of their latest posts
It is also possible to have different limits for unauthenticated and authenticated users: the keyword value must be a list of two tuples where the first one is a config for unauthenticated users and the second one is for authenticated.
See [`Pleroma.Plugs.RateLimiter`](Pleroma.Plugs.RateLimiter.html) documentation for examples.
+
+Supported rate limiters:
+
+* `:search` for the search requests (account & status search etc.)
+* `:app_account_creation` for registering user accounts from the same IP address
+* `:statuses_actions` for create / delete / fav / unfav / reblog / unreblog actions on any statuses
+* `:status_id_action` for fav / unfav or reblog / unreblog actions on the same status by the same user