A delivery loop was detected which causes this email to be undeliverable when using a domain alias with Google Apps

Question

This is a follow-on to the question "How can I add an email alias to a domain alias in Google Apps?"

A primary domain has been successfully set-up with Google Apps (not G Suite) e.g. domain1.com

A secondary domain alias to the primary domain has also been setup. It has been verified e.g. domain2.com.

Although I successfully receive an email that is sent to [email protected], the error message "A delivery loop was detected which causes this email to be undeliverable" is received when an email is sent to [email protected].

It has been 24 hours since the domain alias was added.

Is there any additional step that must be completed?

Answer 1

This has wasted a good couple of hours of my day today.

Log in to your Admin account at admin.google.com

Users / Problem User / User Information / Email Routing

In RED it says End-user routing has been discontinued. You can manage destinations using recipient mapping. You can also create an address list used to prevent routing rules from applying to specific users.

It offers a button to clear End-user routing. I have no idea where this end user routing came from because the account had never been used before today!

Clearing "end-user routing" made the loop go away.

Answer 2

I had the same issue. My solution was as follows:

• Log in to your Admin account at admin.google.com
• Go to: Users / Problem User / User Information / Alternative email addresses (email alias)
• Add aliases with the secondary domain. Eg. [email protected], etc.

Emails to the secondary aliases should then arrive in your primary domain inbox.

Answer 3

I had this issue as well, but with Google Domains forwarding. It turns out that clicking the big red button "Restore Google Workspace Records" on the Domains/Email page (which I did) adds DNS rules that interfere with Domains forwarding rules.

To remove Google Workspace DNS rules:

• Visit https://domains.google.com/registrar/mydomain/dns (replace "mydomain" with your domain)
• Scroll down and click Google Workspace to select the relevant DNS rules
• Click "Delete" next to "Manage"

To re-insert the Google Domains email forwarding records:

• click Email on the left side
• from the yellow banner, click Enable email forwarding only

These changes can take minutes and up to 24-48 hrs to fully propagate.