If you're interested in receiving emails locally you can use MailDev to intercept emails and display them in a local inbox.
Install the MailDev CLI globally:
npm i -g maildev
Assuming you have FxA running locally you'll need to stop the
yarn pm2 stop inbox
Start MailDev on port 9999. You may need to start it with
sudo maildev -s 9999
All emails will now be sent to the local inbox, which you can access at http://localhost:1080