feat: Implement send email action

packages/backend/src/apps/smtp/auth/verify-credentials.ts

@@ -1,18 +1,8 @@
 import { IGlobalVariable } from '@automatisch/types';
-import nodemailer, { TransportOptions } from 'nodemailer';
+import transporter from '../common/transporter';
 
 const verifyCredentials = async ($: IGlobalVariable) => {
-  const client = nodemailer.createTransport({
-    host: $.auth.data.host,
-    port: $.auth.data.port,
-    secure: $.auth.data.useTls,
-    auth: {
-      user: $.auth.data.username,
-      pass: $.auth.data.password,
-    },
-  } as TransportOptions);
-
-  await client.verify();
+  await transporter($).verify();
 
   await $.auth.set({
     screenName: $.auth.data.username,