Official demo
MERNMail hosts an official demo that connects to Ethereal Email. You can access the demo at demo.mernmail.org.
If you try to send an email message from this demo, the email message will not be sent, but instead delivered to the sender's inbox.
You need to create an email account on Ethereal Email before logging into the MERNMail demo. The credentials of the Ethereal Email account are visible after creating it. Use the username and the password to log into MERNMail demo.