As you know, I am a great fan of MW too, but I am still waiting a reply from them as to how to handle the incorrect return addresses. A significant number are coming in with these and I cannot bounce them. eg MW sees them as xyza@(). The actual return address is, eg, xyza@earthlink.
I use earthlink as an example 'cos I get a NUMBER from that ISP (yes, I have contacted them). A correct earthlink addy would be
[email protected]
Otherwise MW is successful, but I do not think that the computer that is generating the spam even NOTICES the bounce!
Any ideas?