SMTP server - Fastmail
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You can set up an SMTP server using Fastmail in one simple step by creating an “App password”
An auto-generated password to secure your app.
login to your Fastmail email account
Enter the settings
Click on the “Password & Security” tab
Click on the “New app password” button
Choose a “Custom” name
Select the SMTP option
Click on the “Generate” button
Make sure to copy the value of the generated password and save it (you will not be able to retrieve this password if you lose it)
Copy the password, then click on the "done" button.
That is it! Now you can use your App password and email address to customize your email communication.
Hint: The port number for Gmail SMTP is 587.