What is Challenge-Response Spam Filtering? A challenge-response spam filtering system is a type of spam filter that is used to prevent spam email messages. When a sender sends an email message, a challenge is sent to the sender. A legitimate user can solve the...
What is an Email Gateway? An email gateway is a type of email server that protects the internal email servers of an organization. All incoming and outgoing email messages pass through the email gateway. The email gateway scans the messages for malware, blocks spam...
What is Unified Threat Management (UTM)? Unified Threat Management or UTM refers to a security solution that provides multiple security functionalities. A UTM solution usually includes a firewall, IDS, IPS, anti-virus solution, etc. from the same vendor and it...
Attackers often send a spam message with a forged return address. In that case, if the email is sent to an email address where emails cannot be delivered and the recipient mail server sends a bounce message to the forged return address asynchronously, then it will...
What is backscatter? Attackers often forge the from and reply-to address of an email to send spam messages. When a receiving server receives such email spam with a forged sender address and later realizes that it cannot deliver the email message, it sends a bounce...
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