Lyris User's Guide
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Table of Contents
Lyris Email Commands
Web Interface for Users
Server Administrator
Site Administrator
List Administrator
Other Topics
Security Considerations
Security Issues Relating to Members
Access to the list archives
Access to the list of members
Access to Subscribe to the Mailing List
Steps to restrict false impersonations
Security Features for Posting Messages
List admin posting
Admin Moderation
Number moderating
Allow Non-Member Posting
Action Phrase Restrictions
Password based posting
Banning members
Disallow Email Posting
Secure HTTP web interface
Lyris extensions
Confirmed subscriptions
Duplicate messages
Maximum posts per member
Maximum quoting allowed
Maximum Messages Per Day
Limit the Message Size
Reject Email Attachments
Moderator auto-approval
Command detection
Anonymous Postings
Access to unsubscribe and change settings
Visibility of the existence of the mailing list
Web Interface Access
Overview of Lyris Posting Security
Security Considerations of the From: field
Security Recommendations for Announcement lists
How Lyris Determines the Identity of the Person Posting
Lyris Mail Merge
The Lyris command line
Modifying lyris.plc
Add-On Packages
Installing and Upgrading
Frequently Asked Questions


Cross-posted messages are email messages that are sent to more than one mailing list on a server.

If a person is a member of several mailing lists, they might choose to send an announcement to all the mailing lists they belong to about something they feel is important. You, as the list administrator, may wish to prevent this. Cross-posting is a common technique of "spammers".

By default, cross posting is forbidden, but it can be allowed by changing the list settings for a mailing list.

A common use for cross-posting is when a useful announcement does need to be sent to many mailing lists. Support, for instance, that you were the list administrator and wanted to tell your many users that you would disconnecting your Lyris server for a week while you moved your house.

In this case, you would want to allow the cross posting. However, if a person is a member of several of your mailing lists, they would receive multiple copies of the announcement: one for each mailing list they are on.

There is a simple solution to this problem: with a cross posted message, Lyris can be told to remove the members that appear on multiple mailing lists, so that each person receives exactly one copy of your announcement. This is set in the list settings for each particular mailing lists,

The postings from List administrators are always allowed to be crossposting (in other words, this setting has no effect on list admin postings).

Other pages which link to this page:
  • Security Features for Posting Messages
  • Page 383 of 556