The default "from" email address when using the "Forward Signal Via Email" (or sending emails via Action Flows and Skills in Celonis) is noreply@celonismail.com. This is the standard address used when configuring the "Email by Celonis" action within a Skill, which is then triggered by an Action Flow. This setup is recommended for most use cases and ensures reliable delivery without email spoofing issues. You can find a step-by-step guide for configuring this in the official documentation and community articles (see reference: https://docs.celonis.com/en/topic-file-names--html-.html).If you attempt to set a custom "from" address (such as your organization's shared server), the email may still be sent from noreply@celonismail.com unless you have specifically configured and authenticated a custom SMTP connection. Simply populating the "from" field does not guarantee the email will be sent from that address unless the underlying connection is properly established and authenticated. Inconsistent behavior may occur if the connection is not set up correctly, and spoofing the "from" address is not recommended (see reference: 
- Celonis documentation: https://docs.celonis.com/en/topic-file-names--html-.html