No emails sent out from Kotahi (DEV instance)

Hi, we have installed Kotahi and set it as development environment for the moment. When I invite reviewers to peer review, though, invitation emails are not delivered to the email addresses.
I wonder if this is as per design in case Kotahi is a development instance, or if we are missing some configuration.
Any help would be appreciated.

Hi @silvaco have you added your email credentials to the Configuration>Notifications and E-Mail>Emails section?

This is a helpful link to utilise the correct Gmail password key; Sign in with app passwords - Google Account Help