It is much
safer to just redirect suspected spam to a separate folder and manually sift through them.
Each message delivered by procmail is processed against each recipe. Any recipes whose
condition line matches the message are processed. However, recipes that match a message
but that are not specifically set to copy the message redirect the message from the normal
INBOX. For example, the second recipe redirects messages from the guitar-list to the
guitar folder. These messages will not appear in the normal inbox mail folder.
The third example shown above, creating auto-reply messages, is a great feature to use
when you know you will be away from your mail server for an extended period of time.
Any message sent to your email account will generate an automatic reply message to the
sender with any text that you need.
Antispam Tools
Some MDA packages allow you to use prepackaged antispam tools, which are infinitely
more sophisticated that any procmail recipes you could write. Modern antispam tools use
Bayesian filtering to identify words and patterns that are typical in spam messages.
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