SpamFoo Blog
Guides for mail server admins, how SpamFoo works, and stories from the companies that run it.
Business email compromise: what it is and how to stop it
The common forms of BEC, why spam filters miss it and how protected identities catch it.
How one correction teaches a mailbox
What happens when someone clicks "Mark as spam", and why the next message from that sender follows.
How SmarterMail added SpamFoo for its customers
SmarterTools built SpamFoo into SmarterMail and gave every customer Email Classification.
Why greylisting isn't enough anymore
Sign-in codes, time-sensitive mail, spammers that retry and senders that rotate IP addresses. Here's what to use instead.