One of our clients regularly sends email to us and they have 2 email scrubbers on their side named hubcas1 and hubcas2. All email from 1 is allowed through and our firewall identifies the type of traffic as application SMTP as it should be. All email from scrubber 2 is being blocked and it's traffic is identified by our sidewinder as type "ALL". That is the only difference I see in the analysis of each kind of email sent.
Is a setting on the senders side messing this up???? Else how could I allow SMTP traffic through from scrubber hubcas2 without opening things up too much. I know the IP # in question of hubcas2. Thanks in advance for any suggestions.