Google Mail errors, Facebook redirect?

Question

Facebook

One of the projects I'm involved in has a mail on Google Apps.
Recently, users who send emails to us have started receiving strange error messages in response, for example,

Your message could not be delivered because of previous failures during delivery attempts to this mailing list. Please update the list with valid addresses.<br/>
 <br/>
This is an example of some of the bounces we received:<br/>
 <br/>
----------------------------------------------<br/>
Recipient: [email protected]нашдомен.com<br/>
 <br/>
550 550 5.7.1 Unauthenticated email is not accepted from this domain. e7si9425932wer.61 (state 18).<br/>
Message-Id: &lt;[email protected]&gt;<br/>
 <br/>
----------------------------------------------<br/>
Recipient: [email protected]нашдомен.com<br/>
 <br/>
550 550 5.7.1 Unauthenticated email is not accepted from this domain. e7si9425932wer.61 (state 18).<br/>
Message-Id: &lt;[email protected]&gt;<br/>
 <br/>
----------------------------------------------<br/>
Recipient: [email protected]нашдомен.com<br/>
 <br/>
550 550 5.7.1 Unauthenticated email is not accepted from this domain. o51si15531851eei.5 (state 18).<br/>
Message-Id: &lt;[email protected]&gt;<br/>

Such errors occur when an email is sent to a group address.
I checked several user accounts from this group - there are no redirects or filters in their settings.
And what about Facebook?

Answer 1

you do not have rights to send messages to this address… there are restrictions on sending to this mailing list. Usually, you just need to be in this mailing list or be added.
Message-Id is just a message identifier...

Answer 2

We found a similar problem today - on the 19th, mail stopped coming to mail groups.
Can you share your knowledge about the problem?

Answer 3

The problem is not isolated:
www.google.com/support/forum/p/Google+Apps/thread?tid=3d8e88c487bf8b2c&hl=en&fid=3d8e88c487bf8b2c00049a58c10fadfb