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Originally Posted by chopsmcp
In my experience this isn't entirely accurate. AIUI Spampal uses the "TOP" command to get headers to send to DNSBLs. You can then choose to have it add a tag to the subject line based on the result. Using OE it's then possible to set up a "delete on server" rule which deletes the mail without downloading the body. What it comes down to is how much confidence you have in different blocklists. In my case, anything from China or Korea gets tagged CHI-KOR and I never see it. I'm thinking about extending that to the Spamhaus SBL+XBL lists, as I've had such good results with them. (Zero false positives.)
I'm puzzled as to why this works - after all, spampal can only tag the mail on the local machine, not ntl's server - but for some reason it does.
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AFAIK Spampal does what the email client tells it to do. Spampal is a mail proxy - if your email client requests just the email headers and not the full body, then that's what Spampal will retrieve and process. Likewise, if your email client requests the full email, including body, that's what Spampal will do. Spampal will work with IMAP so you can always use IMAP if you don't want to download the spam.
I've added an extra DNSBL for countries and configured Spampal to use its aggressive "Pre-created filtering strategy". I have Zone Alarm Pro so I've disabled the extra regex filter rule set for viruses and added a few rules to catch quarantined attachments. Everything works great so I'd hope that NTL give me the option to opt out of their attempts at filtering.