Hi, we have a situation where two different companies both have SBS 2007 servers.
When Company B tries to send to Company A, they get a bounce back (see attached)
Mail in the opposite direction works fine.
We've disabled spam filters on Company A, and don't see any obvious cause of this problem. Mail flow was fine up until recently, and no settings have been changed on either server in the last few months, and this problem developed last week. We even looked at Windows Updates, and don't see any that came down at roughly the time this started.
Thanks for any advice
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Diagnostic information for administrators:
Generating server: CompanyBServer.CompanyBDomain.local
CompanyAServer.CompanyADomain.local #530 5.7.1 Client was not authenticated ##