diff --git a/docs/CONFIG.md b/docs/CONFIG.md
index 97cf0c55..ccecdf89 100644
--- a/docs/CONFIG.md
+++ b/docs/CONFIG.md
@@ -6,16 +6,16 @@ You can configure MailHog using command line options or environment variables:
 | Environment         | Command line    | Default         | Description
 | ------------------- | --------------- | --------------- | -----------
 | MH_CORS_ORIGIN      | -cors-origin    |                 | If set, an Access-Control-Allow-Origin header is returned for API endpoints
-| MH_HOSTNAME         | -hostname       | mailhog.example | Hostname to use for EHLO/HELO and message IDs
+| MH_HOSTNAME         | -hostname       | localhost       | Hostname to use for EHLO/HELO and message IDs
 | MH_API_BIND_ADDR    | -api-bind-addr  | 0.0.0.0:8025    | Interface and port for HTTP API server to bind to
 | MH_UI_BIND_ADDR     | -ui-bind-addr   | 0.0.0.0:8025    | Interface and port for HTTP UI server to bind to
 | MH_MAILDIR_PATH     | -maildir-path   |                 | Maildir path (for maildir storage backend)
 | MH_MONGO_COLLECTION | -mongo-coll     | messages        | MongoDB collection name for message storage
 | MH_MONGO_DB         | -mongo-db       | mailhog         | MongoDB database name for message storage
 | MH_MONGO_URI        | -mongo-uri      | 127.0.0.1:27017 | MongoDB host and port
-| MH_SMTP_BIND_ADDR   | -smtp-bind-addr | 0.0.0.0:1025    | Interface and port for SMTP server to bind to
+| MH_SMTP_BIND_ADDR   | -smtp-bind-addr | localhost:1025  | Interface and port for SMTP server to bind to
 | MH_STORAGE          | -storage        | memory          | Set message storage: memory / mongodb / maildir
-| MH_OUTGOING_SMTP    | -outgoing-smtp  |                 | JSON file defining outgoing SMTP servers
+| MH_OUTGOING_SMTP    | -outgoing-smtp  | localhost:1025  | JSON file defining outgoing SMTP servers
 | MH_UI_WEB_PATH      | -ui-web-path    |                 | WebPath under which the UI is served (without leading or trailing slashes), e.g. 'mailhog'
 | MH_AUTH_FILE        | -auth-file      |                 | A username:bcryptpw mapping file