> Is it a properly formatted header according to the relevant RFCs?  If
> not, this entry in an ACL in my exim.conf rejects it at SMTP time.

not sure there.  presumably it's all ok.

> If you want, how about coming up with a test like exim's that looks
> for syntactic validity of the header.  All real messages will have
> proper headers.  There are valid reasons for Undisclosed Recipients in
> the To: header (think Bcc of a newsletter or something).

I know that there are valid reasons (I have a friend who uses bcc's for 
all of her mass-emails-to-friends stuff), but isn't that the point of 
using a scoring system?  I get WAY more undisclosed.recipients@ messages 
from spammers than I do from mailing lists (most of which either just 
don't have a To field, or include the list address, or some generic list 
name) or friends...

anyway, just a suggestion.  It's a "check" on a variety of other spam 
filters that I've seen, so I thought I'd mention it.

-Chris


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