Lyris User's Guide
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Loop Detection
Table of Contents
Lyris Email Commands
Web Interface for Users
Server Administrator
Overview of Server Administrator
Server Admin Menu
Sites Menu
Server Config
Activation code and admin contact
TCP/IP Settings
Mail Receiving Settings
Incoming From: Mail Rewrites
Incoming To: Mail Rewrites
Ban Mail From
Remove Lyris Addresses
Mail Receive Rules
Max Message Size
Fast Bounce Handling
Loop Detection
Loop Exception
Mail Delivery Settings
Lyris Command Protocol (LCP) Settings
Programming Extensions at the Server Level
Miscellaneous Server Config Settings
Server Documents
Server Action Phrases
Server People
Incoming Mail
Outgoing Mail
Server Admin Log
Shutdown Server
Site Administrator
List Administrator
Other Topics
Add-On Packages
Installing and Upgrading
Frequently Asked Questions

Loop Detection

Lyris automatically tracks how many messages per day are sent From a foreign address to a Lyris address, and if the number of messages in one day exceeds the Loop Detection threshold, Lyris cuts off the mailings, issuing a single refusal message, and then discarding the rest of the messages in that 24 hour period.

This feature is useful for automatically breaking mail loops that aren't able to be stopped through Lyris' other mechanism, and also for stopping a mail bomb attack. Say, for example, that someone sets their email program to send thousands of messages to your autoresponder, in order to mail bomb you, and tie up your server, this feature will detect this, notify the administrator and automatically stop the process.

Note: some sites use a Web CGI script to sign people up to their list. In such a case, the script might be sending from the same address every time, and to the same address every time, and thus be perceived as a mail loop, if the quantity of mailings goes over the loop detection threshold. In such a case, you should put an exception for that specific from/to combination to exempt your script from this test. If you forget to do this, the server admin will receive notification of the potential loop, and you'll thus be reminded of the need for an exception.

Other pages which link to this page:
  • Mail Receiving Settings
  • Page 123 of 556