Your search for "spam" returned 9 results:
Challenge / Response (C/R) Spam Filtering
A feature to send a reply email automatically with a challenge to unknown senders. The sender is asked to perform some action to assure delivery of the original message, which would otherwise not be delivered. Senders that have previously performed the challenging action would be automatically whitelisted.
1 comment
25
Validate Sender Address using Recipient Validation
Validate sender email addresses using the same valid email address source as the Recipient Validation test if it claims to be from any of the local domains. For instance, if the sender is [email protected] and example.com is my domain, check if [email protected] is a valid email address.
17
Sender Callout Verification
Add a new test for Sender Callout Verifications. This type of test connects back to the email sender's server and attempts to find out if the sender is valid, by starting an SMTP conversation (no email is actually sent). If the sender's email address is rejected as invalid by the sender's email server, the sender email address is considered forged and the email is blacklisted.
[Note from Vamsoft: The value and side-effects of this anti-spam technique is disputed in the industry.
For instance, simultaneous Sender Callout Verifications from thousands of servers (as a result of a major
spam breakout with forged sender email addresses) can result in a kind of Denial Of Service attack performed
against the forged sender's email servers].
24
DONE Honeypot (Spamtrap)
Blacklist the sender IP address of those writing to specific local email addresses, e.g. addresses published on
the company web site specifically as honeypot (spamtrap) addresses. This feature would be based on the assumption
that whoever sends email to the honeypot address(es) must be a wrongdoer, because the honeypot address may be
collected only by robots scanning the internet (and the web, specifically) for email addresses, which is a typical
spammer behavior.