feat(storage): add comprehensive tests for StorageManager with memory, filesystem, and custom function backends

feat(email): implement EmailSendJob class for robust email delivery with retry logic and MX record resolution

feat(mail): restructure mail module exports for simplified access to core and delivery functionalities

ts/mail/delivery/smtpserver/certificate-utils.ts

@@ -3,16 +3,17 @@
  * Provides utilities for managing TLS certificates
  */
 
-import * as plugins from '../../../plugins.ts';
+import * as fs from 'fs';
+import * as tls from 'tls';
 import { SmtpLogger } from './utils/logging.ts';
 
 /**
  * Certificate data
  */
 export interface ICertificateData {
-  key: plugins.Buffer;
-  cert: plugins.Buffer;
-  ca?: plugins.Buffer;
+  key: Buffer;
+  cert: Buffer;
+  ca?: Buffer;
 }
 
 /**
@@ -154,7 +155,7 @@ export function loadCertificatesFromString(options: {
       const caBuffer = caStr ? Buffer.from(caStr, 'utf8') : undefined;
       
       // Test the certificates first
-      const secureContext = plugins.tls.createSecureContext({
+      const secureContext = tls.createSecureContext({
         key: keyBuffer,
         cert: certBuffer,
         ca: caBuffer
@@ -205,7 +206,7 @@ export function loadCertificatesFromString(options: {
       
       // Validate the certificates by attempting to create a secure context
       try {
-        const secureContext = plugins.tls.createSecureContext({
+        const secureContext = tls.createSecureContext({
           key: keyBuffer,
           cert: certBuffer,
           ca: caBuffer
@@ -252,9 +253,9 @@ export function loadCertificatesFromFiles(options: {
 }): ICertificateData {
   try {
     // Read files directly as Buffers
-    const key = plugins.fs.readFileSync(options.keyPath);
-    const cert = plugins.fs.readFileSync(options.certPath);
-    const ca = options.caPath ? plugins.fs.readFileSync(options.caPath) : undefined;
+    const key = fs.readFileSync(options.keyPath);
+    const cert = fs.readFileSync(options.certPath);
+    const ca = options.caPath ? fs.readFileSync(options.caPath) : undefined;
     
     // Log for debugging
     SmtpLogger.debug('Certificate file properties', {
@@ -265,7 +266,7 @@ export function loadCertificatesFromFiles(options: {
     
     // Validate the certificates by attempting to create a secure context
     try {
-      const secureContext = plugins.tls.createSecureContext({
+      const secureContext = tls.createSecureContext({
         key,
         cert,
         ca
@@ -363,8 +364,8 @@ ORWZbz+8rBL0JIeA7eFxEA==
 export function createTlsOptions(
   certificates: ICertificateData,
   isServer: boolean = true
-): plugins.tls.TlsOptions {
-  const options: plugins.tls.TlsOptions = {
+): tls.TlsOptions {
+  const options: tls.TlsOptions = {
     key: certificates.key,
     cert: certificates.cert,
     ca: certificates.ca,
@@ -377,7 +378,7 @@ export function createTlsOptions(
     rejectUnauthorized: false,
     // Longer handshake timeout for reliability
     handshakeTimeout: 30000,
-    // TLS renegotiation option (removed - not supported in newer Node.ts)
+    // TLS renegotiation option (removed - not supported in newer Node.js)
     // Increase timeout for better reliability under test conditions
     sessionTimeout: 600,
     // Let the client choose the cipher for better compatibility