How do I send email from my app?

To send email from your app, you usually use an email service rather than trying to connect directly to an email provider yourself.

Common ways

1) Use an email API service

This is the easiest and most reliable option.

Popular services:

• SendGrid
• Mailgun
• Amazon SES
• Postmark
• Resend

Typical flow:

1. Create an account with the service.
2. Verify your sending domain.
3. Get an API key.
4. Call their API from your backend to send mail.

Example idea:

• User signs up
• Your backend calls SendGrid/Postmark/etc.
• The service delivers the email

2) Use SMTP

If you already have mail server credentials, your app can send via SMTP.

You need:

• SMTP host
• SMTP port
• username/password
• TLS/SSL enabled

This is common for internal apps or when using a provider like Gmail, Outlook, or a business mail server.

3) Use a backend framework/library

Most languages have mail libraries that work with SMTP or APIs.

Examples:

• Node.js: Nodemailer
• Python: smtplib, Django email backend, Flask-Mail
• PHP: PHPMailer, Symfony Mailer
• Ruby: Action Mailer
• Java: Jakarta Mail

Important best practices

• Send from your backend, not directly from frontend code
• Don’t expose credentials in the browser/app
• Verify your domain with SPF, DKIM, and DMARC
• Use a transactional email service for password resets, notifications, receipts, etc.
• Handle bounces, spam complaints, and rate limits

Minimal example concept

If you tell me your stack, I can give you exact code. For example:

• Node.js
• Python
• PHP
• Java
• C#
• Ruby
• Go

If you want, I can show you a complete “send email” example for your app’s language/framework.