fix(email options)

selfprivacy-module.nix

@@ -186,5 +186,58 @@ with lib;
         default = false;
       };
     };
+
+    #################
+    #     Email     #
+    #################
+    email = with lib; mkOption {
+      type = types.attrsOf (
+        types.submodule (
+          { name, ... }: {
+            options = {
+              subdomain = mkOption {
+                type = with types; strMatching "[A-Za-z0-9][A-Za-z0-9\-]{0,61}[A-Za-z0-9]";
+                example = "myservice";
+                default = config.sp.domain;
+                description = "Email subdomain";
+              };
+
+              systemdTargets = mkOption {
+                type = with types; listOf strMatchig "[a-zA-Z0-9@%:_.\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)";
+                default = [];
+                example = [ "generate-mastodon-email-password.service" ];
+                description = "Systemd target which generates password file.";
+              };
+
+              sendOnly = mkOption {
+                type = with types; bool;
+                default = true;
+                example = "false";
+                description = "Specifies if the account should be a send-only account. Emails sent to send-only accounts will be rejected.";
+              };
+
+              hashedPasswordFile = mkOption {
+                type = with types; str;
+                example = "/run/keys/mastodon/email_password";
+                description = "Path where a file containing password hash located.";
+              };
+            };
+          }
+        )
+      );
+
+      description = ''
+        Don't use this option to create regular users!!!
+
+        This option gives modules possibility to create mailboxes to send emails, e.g. notifications or reminders.
+      '';
+
+      example = {
+        "noreply@mastodon.example.tld" = {
+          hashedPasswordFile = "/run/keys/mastodon/email_password";
+          systemdTargets = [ "generate-mastodon-email-password.service" ];
+        };
+      };
+    };
   };
 }