initial

ts/errors/index.ts

@@ -0,0 +1,24 @@
+/**
+ * Error types module stub
+ */
+
+export class SmtpError extends Error {
+  constructor(message: string, public code?: number) {
+    super(message);
+    this.name = 'SmtpError';
+  }
+}
+
+export class AuthenticationError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'AuthenticationError';
+  }
+}
+
+export class RateLimitError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'RateLimitError';
+  }
+}