We are not recieving mail from many different companies. In the event viewer I see this:
Any help would be appreciated as this is very urgent. Thank You.
Event Type: Error
Event Source: MSExchangeTransport
Event Category: SmtpReceive
Event ID: 1035
Time: 7:52:28 AM
Inbound authentication failed with error LogonDenied for Receive connector Default GSMAIL. The authentication mechanism is Gssapi. The source IP address of the client who tried to authenticate to Microsoft Exchange is [220.127.116.11].
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.