feat(mailer-smtp): add SCRAM-SHA-256 auth, Ed25519 DKIM, opportunistic TLS, SNI cert selection, pipelining and delivery/bridge improvements

ts/mail/routing/classes.dkim.manager.ts

@@ -131,11 +131,15 @@ export class DkimManager {
       const { privateKey } = await this.dkimCreator.readDKIMKeys(domain);
       const rawEmail = email.toRFC822String();
 
+      // Detect key type from PEM header
+      const keyType = privateKey.includes('ED25519') ? 'ed25519' : 'rsa';
+
       const signResult = await this.rustBridge.signDkim({
         rawMessage: rawEmail,
         domain,
         selector,
         privateKey,
+        keyType,
       });
 
       if (signResult.header) {