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Google Gmail problem - "Nested groups detected".

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IainB:
I think Google engineers must have been making changes somewhere, because something has changed in the service.
For over 4 years I have been using a rule in my Gmail that forwards certain incoming messages to a Google group.
It's a very useful feature - when I am on a client's site, I can usually access this group through most corporate security filters, whereas I might not be able to access my Gmail account to read these messages.

All of a sudden, I have stared getting this error:
Delivery to the following recipient failed permanently:

    [email protected] [not a real email address]

Technical details of permanent failure:
Nested groups detected

--- End quote ---

Anyone know what/why this is?
I don't think I have ever used the nested groups feature of Google groups, but I am aware that it is/was advertised by Google as a benefit for their commercial apps clients. I know little else about it.

justice:
NOt sure how much this will help you, but it might:
http://www.google.com/support/forum/p/Google%20Apps/thread?tid=647d5de1c8ef2c45&hl=en

Example of nested groups:
Group 'le1' contains [email protected]
Group 'ue' contains [email protected]
Group 'everyone' contains Group 'le1' and Group 'ue'

Send email to Group 'everyone'.

--- End quote ---
[email protected] is in a nested group.

So perhaps [email protected] is subscribed to a your group and another subscriber of your group is a second group of which [email protected] also is a subscriber to. Therrefore this address is subscribed more than once.

IainB:
@justice: Thanks. I hadn't seen that particular link, but I did read up about "Nested groups", and they seemed like a useful feature from what Google documentation seemed to be saying about them.
Be that as it may, it doesn't help to explain why I have suddenly only now started getting this block error message in Gmail, when I haven't changed anything to do with it - in Gmail or Groups. It's rather strange.
That's why I say Google must have changed something.

Maybe Google is about to announce the withdrawal of yet another service - who knows?

IainB:
Looks like other users are finding they have the same problem - I just found some posts about it in the Gmail support forum:
Delivery to the following recipient failed permanently: Nested groups detected?

So I added a post there as well.

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