On 18 Mar 2015, at 17:24, Axb wrote:
Why is "Internal" or local mail sent thru SA?
If the MTA handles outbound mail from Windows users, passing their mail through SA is prudent. There are spamming trojans that figure out how to use the victim's legitimate submission config including credentials, evading the difficulties of trying to send directly and sending slowly enough to avoid rate-limiting measures. The Swen worm was doing this a decade ago, so it is hardly a new thing.
