Thanks Chris. It sounds like we are having the same problem. Just to forestall the responses from people running Exchange 5.5: this does NOT seem to be a problem in 5.5 and most of the solutions I have seen posted to this list seem to work with Exchange 5.5. This problem seems peculiar to Public Folders on Exchange 2000.
Ryan, I've found that if mail is sent directly to a mail-enabled Public
Folder's email address, IE from amavisd-new or Postfix, its headers will
make it through with IMAP. However, if an email is moved to or from a
Public Folder with Outlook (regardless of whether or not the public
folder is mail-enabled), then its headers get truncated. So I can at
least train bayes by having any emails over my threshold of 6.0 get
redirected to [EMAIL PROTECTED] by amavisd-new and they show up in the SPAM
folder. And I can sa-learn them. Unfortunately that's about it
though... Moving false positives to a Public HAM folder truncates
headers, as does false negatives getting moved to the SPAM folder.
I think bayes can still learn with incomplete headers, though it's not
ideal.
I'm not sure how bayes can be used with Exchange without bypassing Exchange completely in some way. I'd like to see other people's solutions to this problem (or maybe they just don't know about the problem). Maybe somebody can come up with IMAP client patch that can retrieve the full headers, as they are actually retained by Outlook when messages are moved to or from Public Folders, just not when IMAP is used.
Chris
My main problem isn't so much with false positives (I forward all tagged spam to mboxes using MailScanner so I get the headers unmolested by Exchange), but with false negatives received by the end Outlook users. Once they drag them into the Public Folder, as you point out, the headers get truncated. I've even resorted to trying to reconstruct the original message by copying what little header information Outlook gives and then exporting the message to Outlook Express to get the body source. As you can imagine this is pretty time consuming and doesn't always reproduce the original message.
Why does Microsoft have to make everything so hard?? :-)
Ryan
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