Exchange 2010 - 400 4.4.7 error
Seem to be having a problem with our Exchange server. Essentially we have a long list of email sat in a queue unable to send all with the error code 400 4.4.7.
Having done some quick research into it, most suggestions are that the emails are being sent to a domain which cannot accept them, however there is a large number of different domains that I can see (certainly over 50) so I find it hard to believe that all these domains cannot receive email from us.
We are receiving emails into school, it is only sending them back out again where the problem lies.
I'd post a screenshot, but we've just cleared out the queue to see if that helps anything....as soon as the error regenerates I'll post one.
Any help anyone can give us would be gratefully received.