The reason I ask is that I know bounced messages from MS Exchange servers appear to come from <> by default. Since it is MSN, I wouldn't be surprised if they are running a few Exchange servers. You could have just really made a few of their admins really PO'ed and now they are blacklisting you.
OK, I read where they are trying to cut down on abuse and if an MTA is refusing null senders, that could be a super-sensitive pretext for the to blacklisting. They certainly know that tons of spam sources refuses all inbound traffic.
So, if that's one way to get on their blacklist, how do you get off? Do they keep you blacklisted as long as you refuse null senders? A good tactic. we'll see.
We have similar tactic in IMGate. If your [EMAIL PROTECTED] won't accept mail from us (no matter what we use as our sender, null or not), then we won't accept mail from [EMAIL PROTECTED]
This is called SAV, sender address verification, and it's a new and powerful technique for IMGate.
Len
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