On Sun, 2011-06-05 at 07:00 -0700, asimhafeez wrote: > Hi, > > Is there any possibility to delete spam instead of marking (rewriting) the > emails as [SPAM] in subject. > In my scenario users mailboxes are hosted to another machine and i want to > filter the spam in a separate machine instead of filtering it on the email > hosting server. > As others have said,it depends how you are passing mail to SA. Bearing in mind that all SA does is to mark mail as spam or ham,here are s0ome possibilities:
- if you're passing mail to SA at SMTP time, i.e. before your MTA accepts it, you can reject the message. THIS IS THE ONLY PLACE WHERE YOU CAN REJECT SPAM. Doing so after your MTA has accepted it will merely add to the spam problem since the sender is almost certainly forged, a rejection after this point will be sent to the poor sod whose address was forged as the sender. - you could implement greylisting at SMTP time and let your MTA scan anything that gets past the greylist with SA. This doesn't answer your question but it does reduce the SA workload. It will also get rid of a lot of spam: when my ISP introduced greylisting the spam I got reduced from 80% of all incoming mail to 8%. - you can add a program after SA in your MTA's spam scanner to redirect spam to a spam bucket address. Some MTAs might let you silently delete spam at this point: AFAIK Postfix, which I use, won't. What you do with the contents of the spam bucket is up to you. - if you're using fetchmail or getmail to retrieve mail from your ISP and its being passed through SA before being sent to an MTA or put in a mailbox then you can add another program that deletes spam by not passing it on to the MTA or whatever. This is OK for a low-volume situation, i.e. a personal system or one belonging to a small business. My system works this way. Everything I've just suggested can be done before the messages are passed to the second machine. - As others have said, you can also use procmail to further process and/or delete spam as it arrives at the recipients mailbox. This allow your users some individual control over the spam they receive. Martin
