Email validation fails for example@localhost address

[sambartik]

Bug Description

The email validation present in the "Setup owner account" page does not allow an email in the form of example@localhost.

Context from this Stack Overflow question:

RFC 2822 (Internet Message Format Standard) allows it but RFC 2821 (SMTP Standard) says it should fail.

To Reproduce

1. Boot up a new instance of n8n
2. Try to enter the email example@localhost to the email field of the setup screen

Expected behavior

Not mark as invalid

Operating System

Ubuntu 24.04

n8n Version

1.56.2

Node.js Version

v20.15.0

Database

PostgreSQL

Execution mode

main (default)

[Joffcom]

Hey @sambartik,

We have created an internal ticket to look into this which we will be tracking as "GHC-197"