Email Forwarding

Email forwarding can be used to redirect incoming emails on an existing DNS zone to another mailbox. Both mailbox-based and catch-all address-based email forwarding are supported.

Create an Email Forwarding Rule

Select the DNS zone for which you want to set up an email forwarding rule. You can then configure a new forwarding rule via the menu items Email Forwarding → Create Forwarding.

Mailbox Forwarding

Enter a mailbox in the Source Email Address field if you want to forward only specific source addresses. Emails sent to non-existent source email addresses will be discarded.

Catch-All Forwarding

Do not enter a mailbox in the "Source Email Address" field to forward all incoming emails for the domain to the desired destination address.

Frequently Asked Questions About Email Forwarding

Are Incoming Emails Checked for Spam?

Incoming emails are checked for spam based on real-time blacklists and, if necessary, rejected during the SMTP dialogue.

See also: Reasons for Rejecting an Email

What happens to emails if the source email address does not exist?

If an email is sent to a nonexistent address, the sender receives an SMTP error code 550 5.1.1 during the SMTP session, along with the error message:

550 5.1.1 <unnkown-user@creoline-demo.com>: Recipient address rejected: 
User unknown in virtual mailbox table (in reply to RCPT TO command)

Technical Implementation

The forwarding email server uses the Sender Rewriting Scheme (SRS for short) to rewrite the envelope sender. This ensures that no original SPF or DMARC policies of the original email are violated. The forwarded email also includes the original and valid DKIM key, if available.