Russell Jones wrote: > Actually that's all the logs show when sending to a non-existent address > that resides on the same physical server, but I got it figured it. > > Believe it or not, it was actually my AVG antivirus. It turns out that > when scanning outgoing mail, by default AVG will use its own "Auto SMTP > server". For some reason it was preventing my client from receiving the > errors. When disabling this "auto smtp server", the popups regarding > invalid user is received properly by Thunderbird and Windows Mail. > > Go figure.
yeah.... just to "enrich the knowledge base", what Av was this?