mi...@palmspringairlines.us wrote:

I've no idea where you got this from... I've never heard of the DELTAG environment variable. I don't think this will do anything...

This will cause maildrop to error out, believing that mail delivery failed for a temporary reason. Maildrop will retry for 3 days or so and then give up, possibly returning a delivery failure to the sender (which in the case of spam, will be faked). This also is not what you want.

Once maildrop is handling an email, the SMTP session has ended, your mail server has accepted the message, there is no way to then reject it. You could *bounce* the email back to the sender but this is very bad form and most spam has a faked sender anyways so it's quite pointless, don't do it. To toilet bowl a message use:

if (/^X-Spam-Status: *YES/) { exit }

thus maildrop will exit cleanly, considering the message delivered without ever writing anything to the user's box. This however means that you've got zero chance of recovering false positives or even knowing that there are false positives. Bad idea also. Better idea:

if (/^X-Spam-Status: *YES/) { to "/some/maildirOrMailbox/of/admin/for/fp/checking" }

Thus, when a user suspects that valid mail is getting marked as spam and deleted, they can ask the admin, the admin can do a search in this mailbox and inform the user.

Jay