Follow the below steps to setup SMTP details to send emails from your address.
Step 1. Log in to your Shopify store and navigate to Apps > Form Builder.
Step 2. Click on the SMTP Setting button
Step 3. Enter SMTP server details. You will need the following details
Host
Port
User Name
Password
From Email
Note: You can get all these details from your email service provider.
Check/Uncheck SMTP Auth and Use Secured Connection fields based on your email service provider instructions.
Step 4. Enter an email to receive a test email, click on the Test Connection button to test your settings.
Step 5. Click on the Submit button to save all the settings.