I am building a website with Express.js. It's just a demo site for now and there are no plans to host it on the live internet. I have a contact form on the site and I want to make it send e-mails to my GMail address with Nodemailer. I want Nodemailer to use a local Postfix server to send the mail.
Given that my computer has no domain name like example.com, what should I use for the Postfix system mail name in this context?