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Email & Spam

Security Topics


Email Spam

Zero Day Window


Bayesian Algorithm

Content and Connection control

Directory Harvesting Attacks

Email Encryption

Email Archiving

File attachments

Image scanning

Port forwarding and MX records

Reputation filters

Encrypted attachments

Grey Listing

Email Monitoring

Internal Email Security

Open Relay

Per user quarantine area

Reverse DNS lookup & SPF

RFC Compliant emails


Email Throttling

What is Spam

Whitelists and Blacklists



Email Throttling


Throttling is a feature which will delay the accept command sent to connecting hosts when they request a connection to send email. It is a method to increase or reduce the amount of accepted incoming connections, usually based on current message load. This will slow down the rate at which email messages arrive and allow more time for a proxy server to process emails.

Throttling will help an email proxy solution to process email, though not overloading the server with too many email messages which may burden its performance.

Further Reading

Wikipedia's guide to Bandwidth Throttling