Hi.
We are an ISP in Austria with some customers using the Astaro ASG 525. These customers have their own domain and mail server but using the backup-mx-service from us. (The backup-mx-service is nothing more than a store and forward of all incoming mail, without spam-filtering at our side.)
Now the problem is that the Astaro-Box rejects incoming mail from our backup-mx. Our backup-mx thinks there is a problem with the primary mx and continuously tries to deliver these mails (but without success). If the rejected mail is a spam-message where the sender- and receiver-address is the same, the notifications generated from the backup-mx passes the Astaro-Box and is delivered right to the user’s inbox. So the user gets no spam, but instead a lot of notifications from our backup-mx.
My question: Does the "Upstream host/networks"-Option solve this problem? The Astaro-Box should simply accept all mails from our backup-mx (no check of these mails against RBLs and Greylisting) but should perform regular anti-spam check in a second step (where the mails have already been accepted by/delivered to the Astaro-Box).
Thanks in advance,
Michael.
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