Pros: It directs known, active Spam floods into a tarpit. This slows down the criminals.
Cons: Zombie computers that send using an ISP's mail server will cause false positives.
Pros: Incredibly effective; currently blocking nearly all inbound Virus and Trojan traffic.
Cons: The first E-mail we see from a given Mail Server to a given customer will be delayed hours.
Pros: Well-maintained and not overly-aggressive service used by many ISPs.
Cons: Some inevitable inertia both adding and removing listings.
Pros: Deletes Non-Delivery Reports.
Cons: Domains with List servers need to get Non-Delivery Reports.
Pros: Very effective.
Cons: Few if any.
Pros: Will identify UCE otherwise missed.
Cons: CPU intensive and the database can be corrupted by Spammer tricks.
Pros: Stops most macro viruses and other Microsoft-specific malware.
Cons: Fussy about attachments.
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