fix(mail): migrate filesystem helpers to fsUtils, update DKIM and mail APIs, harden SMTP client, and bump dependencies

ts/mail/routing/classes.dnsmanager.ts

@@ -57,7 +57,7 @@ export class DNSManager {
     }
     
     // Ensure the DNS records directory exists
-    plugins.smartfile.fs.ensureDirSync(paths.dnsRecordsDir);
+    plugins.fsUtils.ensureDirSync(paths.dnsRecordsDir);
   }
 
   /**
@@ -417,7 +417,7 @@ export class DNSManager {
   public async saveDnsRecommendations(domain: string, records: IDnsRecord[]): Promise<void> {
     try {
       const filePath = plugins.path.join(paths.dnsRecordsDir, `${domain}.recommendations.json`);
-      plugins.smartfile.memory.toFsSync(JSON.stringify(records, null, 2), filePath);
+      plugins.fsUtils.toFsSync(JSON.stringify(records, null, 2), filePath);
       console.log(`DNS recommendations for ${domain} saved to ${filePath}`);
     } catch (error) {
       console.error(`Error saving DNS recommendations for ${domain}:`, error);

ts/mail/routing/classes.unified.email.server.ts

@@ -836,19 +836,14 @@ export class UnifiedEmailServer extends EventEmitter {
             }
             
             // Sign the email
+            const dkimKeys = await this.dkimCreator.readDKIMKeys(options.dkimOptions.domainName);
             const signResult = await plugins.dkimSign(rawEmail, {
+              signingDomain: options.dkimOptions.domainName,
+              selector: options.dkimOptions.keySelector || 'mta',
+              privateKey: dkimKeys.privateKey,
               canonicalization: 'relaxed/relaxed',
               algorithm: 'rsa-sha256',
               signTime: new Date(),
-              signatureData: [
-                {
-                  signingDomain: options.dkimOptions.domainName,
-                  selector: options.dkimOptions.keySelector || 'mta',
-                  privateKey: (await this.dkimCreator.readDKIMKeys(options.dkimOptions.domainName)).privateKey,
-                  algorithm: 'rsa-sha256',
-                  canonicalization: 'relaxed/relaxed'
-                }
-              ]
             });
             
             // Add the DKIM-Signature header to the email
@@ -1435,18 +1430,12 @@ export class UnifiedEmailServer extends EventEmitter {
       
       // Sign the email
       const signResult = await plugins.dkimSign(rawEmail, {
+        signingDomain: domain,
+        selector: selector,
+        privateKey: privateKey,
         canonicalization: 'relaxed/relaxed',
         algorithm: 'rsa-sha256',
         signTime: new Date(),
-        signatureData: [
-          {
-            signingDomain: domain,
-            selector: selector,
-            privateKey: privateKey,
-            algorithm: 'rsa-sha256',
-            canonicalization: 'relaxed/relaxed'
-          }
-        ]
       });
       
       // Add the DKIM-Signature header to the email