Key
No = no
? = maybe
Yes = yes
Runs on client (end-user) machines Runs on mail server or as mail gateway Third-party service MailBoxCop
Protects your mail server No Yes Yes Yes
Provides complete security and control over your enterprise e-mail ? Yes No Yes
Scales to accommodate increased mail volumes without extra cost Yes ? No Yes
Supports any combination of centralized administration and individual user control No ? ? Yes
Updates and global rules can be set centrally, in one place No Yes ? Yes
Enables individual users to create rules for their mail only Yes ? ? Yes
Performs heuristic (Bayesian) analysis per-user No ? ? Yes
Learns what is and is not spam based on your users' feedback No ? No Yes
Automatically tunes filters based on individuals' preferences No ? No Yes
Uses hold-mismatch technology No ? ? Yes
Uses one-shot (“hit-and-run”) technology No ? ? Yes
Can be administered via the web from anywhere ? ? Yes Yes
Enables end-users to access Spam Traps via the web, even when using web mail ? ? Yes Yes
Never loses a valid e-mail No ?

?

Yes
Keeps spam on the sender's server No No No Yes
Works with all e-mail clients and client platforms No ?

n/a

Yes