diff --git a/.env.production.sample b/.env.production.sample
index 4ee2faa..f08954d 100644
--- a/.env.production.sample
+++ b/.env.production.sample
@@ -4,7 +4,9 @@
 ## Values after "=" sign are taken as-is, so don't use double quotes for strings.
 
 ## Base URL of your asciinema web app instance
-BASE_URL=http://localhost:3000
+URL_SCHEME=http
+URL_HOST=localhost
+URL_PORT=3000
 
 ## Base secret key for signing cookies etc.
 ## Run `docker-compose run --rm web bundle exec rake secret`
diff --git a/config/application.rb b/config/application.rb
index 4fd5aa3..bdad471 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -67,7 +67,11 @@ module Asciinema
       )
     end
 
-    config.action_mailer.default_url_options = { protocol: CFG.scheme, host: CFG.hostname_with_port }
+    config.action_mailer.default_url_options = {
+      protocol: CFG.url_scheme,
+      host: CFG.url_host,
+      port: CFG.url_port
+    }
 
     if CFG.smtp_settings
       config.action_mailer.smtp_settings = CFG.smtp_settings
diff --git a/config/cfg.rb b/config/cfg.rb
index 88dbf31..ac3118d 100644
--- a/config/cfg.rb
+++ b/config/cfg.rb
@@ -4,7 +4,9 @@ module Asciinema
   class Configuration
     include Virtus.model
 
-    attribute :base_url,                       String, default: 'http://localhost:3000'
+    attribute :url_scheme,                     String, default: "http"
+    attribute :url_host,                       String, default: "localhost"
+    attribute :url_port,                       Integer, default: 3000
     attribute :bugsnag_api_key,                String
     attribute :aws_access_key_id,              String
     attribute :aws_secret_access_key,          String
@@ -28,31 +30,12 @@ module Asciinema
       end
     end
 
-    def scheme
-      URI.parse(base_url).scheme
-    end
-
-    def hostname
-      URI.parse(base_url).hostname
-    end
-
-    def hostname_with_port
-      uri = URI.parse(base_url)
-      hwp = uri.hostname
-
-      if uri.port != uri.default_port
-        hwp = "#{hwp}:#{uri.port}"
-      end
-
-      hwp
-    end
-
     def ssl?
-      scheme == 'https'
+      url_scheme == 'https'
     end
 
     def smtp_from_address
-      super || "asciinema <hello@#{hostname}>"
+      super || "asciinema <hello@#{url_host}>"
     end
   end
 end
diff --git a/config/prod.exs b/config/prod.exs
index 70a9257..059810f 100644
--- a/config/prod.exs
+++ b/config/prod.exs
@@ -13,7 +13,9 @@ use Mix.Config
 # which you typically run after static files are built.
 config :asciinema, Asciinema.Endpoint,
   http: [port: {:system, "PORT"}],
-  url: [scheme: "https", host: "asciinema.org", port: 443],
+  url: [scheme: System.get_env("URL_SCHEME") || "https",
+        host: System.get_env("URL_HOST") || "asciinema.org",
+        port: String.to_integer(System.get_env("URL_PORT") || "443")],
   cache_static_manifest: "priv/static/manifest.json"
 
 # Do not print debug messages in production