feat(email): Enhance email integration by updating @push.rocks/smartmail to ^2.1.0 and improving the entire email stack including validation, DKIM verification, templating, MIME conversion, and attachment handling.

package.json

@@ -36,7 +36,7 @@
     "@push.rocks/smartdns": "^6.2.2",
     "@push.rocks/smartfile": "^11.0.4",
     "@push.rocks/smartlog": "^3.0.3",
-    "@push.rocks/smartmail": "^2.0.1",
+    "@push.rocks/smartmail": "^2.1.0",
     "@push.rocks/smartpath": "^5.0.5",
     "@push.rocks/smartpromise": "^4.0.3",
     "@push.rocks/smartproxy": "^10.2.0",
@@ -47,6 +47,7 @@
     "@serve.zone/interfaces": "^5.0.4",
     "@tsclass/tsclass": "^9.2.0",
     "@types/mailparser": "^3.4.6",
+    "lru-cache": "^11.1.0",
     "mailauth": "^4.8.4",
     "mailparser": "^3.6.9",
     "uuid": "^11.1.0"