on email tab create a test email button to test smtp integration

src/lib/actions/email.ts

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+
+'use server';
+
+import nodemailer from 'nodemailer';
+import { z } from 'zod';
+
+const emailSettingsSchema = z.object({
+  smtpHost: z.string(),
+  smtpPort: z.number(),
+  smtpUsername: z.string(),
+  smtpPassword: z.string(),
+  fromName: z.string(),
+  fromEmail: z.string().email(),
+});
+
+type EmailSettings = z.infer<typeof emailSettingsSchema>;
+
+export async function sendTestEmail(
+  settings: EmailSettings
+): Promise<{ success: boolean; error?: string }> {
+  const { smtpHost, smtpPort, smtpUsername, smtpPassword, fromName, fromEmail } = settings;
+
+  try {
+    const transporter = nodemailer.createTransport({
+      host: smtpHost,
+      port: smtpPort,
+      secure: smtpPort === 465, // true for 465, false for other ports
+      auth: {
+        user: smtpUsername,
+        pass: smtpPassword,
+      },
+      // In a real app, you might want more robust TLS options
+      // For example, rejecting unauthorized connections
+      tls: {
+        rejectUnauthorized: false
+      }
+    });
+
+    await transporter.verify();
+
+    const mailOptions = {
+      from: `"${fromName}" <${fromEmail}>`,
+      to: fromEmail, // Send the test to the 'from' address
+      subject: 'SMTP Test Email from EstimateFlow',
+      text: 'This is a test email to verify your SMTP settings. If you received this, your configuration is correct.',
+      html: '<p>This is a test email to verify your SMTP settings. If you received this, your configuration is correct.</p>',
+    };
+
+    await transporter.sendMail(mailOptions);
+
+    return { success: true };
+  } catch (error: any) {
+    console.error('Failed to send test email:', error);
+    // Provide a more user-friendly error message
+    let errorMessage = 'An unknown error occurred.';
+    if (error.code === 'ECONNREFUSED') {
+      errorMessage = `Connection refused. Check if the SMTP host (${smtpHost}) and port (${smtpPort}) are correct and accessible.`;
+    } else if (error.code === 'EAUTH') {
+      errorMessage = 'Authentication failed. Please check your SMTP username and password.';
+    } else if (error.message) {
+      errorMessage = error.message;
+    }
+    return { success: false, error: errorMessage };
+  }
+}