# 4 Build & Configure Postal & Create SMTP with Free SSL | Send Unlimited Emails | Part 2
Learn to Install and Build Postal SMTP Server Step by Step for email marketing.
What is Postal?
Postal is open source mailing script, that you can install on cloud or VPS to build SMTP server just like Mailgun, Sendgrid, mailchimp and say good bye to those expensive email service provider.
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What is the video?
0:00 Intro
0:45 Getting Started
1:10 Building Server
1:30 Adding Domain
1:50 Adding DNS records
9:50 Creating First SMTP
10:35 Testing with Mail-tester
13:00 Setting Reverse DNS
16:00 Testing with Appmaildev
17:20 Installing Free SSL Certificate
21:35 Testing Again
22:25 Summary
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